Aristocrat Technologies Australia Pty Ltd v Commissioner of Patents [2022] HCA 29 | Case summary

Aristocrat Technologies Australia Pty Ltd v Commissioner of Patents [2022] HCA 29 | Case summary | Zoe

Since the 1980s, EGMs have been operated electronically including by computers, electronic circuitry and electronic display screens. In 2014, EGMs generally consisted of five virtual or video reels of symbols being displayed in a grid or matrix, each of which spun vertically and stopped at random positions to be displayed in that grid or matrix upon completion of the spin, as determined by a random number generator. Each of the five reels could have strips of symbols that were the same as or different from the symbols that appeared on other reels within that same game, depending on the design of the strip. The total number of symbols on a given reel defined its "reel strip order", which was determined by the game designer and comprised all the symbols that could appear on the reel. The number of possible combinations of symbols in an EGM using virtual or video reels is, in principle, unlimited[5].
To commence a game, a player inserts credits, in the form of money or some other form of payment, and he or she can select the value of a bet. Whether the player wins depends on the occurrences of a winning symbol combination across the five reels on predefined "pay lines" or "win lines". A player may choose to place a wager to cover one or more win lines and each of the five reels is independent of the other. Winning combinations can also be formed if a certain symbol, known as a "scatter" symbol, appears anywhere in the grid[6].
The advent of electronics allowed designers to create new ways to stimulate and maintain player interest, commonly through the use of free games, bonus games or games in addition to the main or base game (a "feature game")[7]. A feature game is a secondary game made available to a player on the occurrence of a defined "trigger event" in the base game. The player can seek to win further prizes in the feature game and will be returned to the base game upon completion. The more successful a feature game is at holding player interest - and encouraging further betting - the more lucrative the EGM is for its operator[8].

The course of authority in this Court[23] has established that, in an application for a patent under the Act, s 18(1)(a) raises the question: "Is this a proper subject of letters patent according to the principles which have been developed for the application of s 6 of the Statute of Monopolies?"
Generally speaking, "working directions and methods of doing things" fall outside s 6 of the Statute of Monopolies[24]. It has long been accepted that claims to a mere scheme, plan or discovery, or mere abstract ideas or information, are not claims for patentable subject matter[25]. Neither the discovery of a natural phenomenon or law of nature, nor a scheme or plan devised for the accomplishing of a task, nor a set of rules whether devised for the conduct of a business or the playing of a game, is the proper subject of letters patent.
It was held by this Court in National Research Development Corporation v Commissioner of Patents ("NRDC")[26], and affirmed in D'Arcy v Myriad Genetics Inc[27], that the terminology of "manner of manufacture" taken from s 6 of the Statute of Monopolies is to be treated as "a concept for case‑by‑case development" applied in accordance with common law methodology. It is not to be confined to the use of any verbal formula in lieu of "manner of manufacture", though various formulations have asked whether there is a "vendible product"[28] or "an artificially created state of affairs"[29].
The practical implementation of a discovery of an abstract truth about nature, or a strategy devised for the conduct of business, or a set of rules devised for a game - whatever the level of originality of the discovery or exhibited in the devising - is not patentable subject matter if the mode of implementation is not itself patentable. The distinction is "between mere intellectual information and a method that affect[s] the operation of an apparatus in a physical form"[30]. So, in Grant v Commissioner of Patents[31], it was held that a method for protecting assets from unsecured judgment creditors was not patentable. The method comprised establishing a trust, giving money to the trust, borrowing said money from the trust and the trustee securing the loan by taking a charge for the money over the asset. The Full Court (Heerey, Kiefel and Bennett JJ) concluded that the claimed method was "at best an abstract, intangible situation"; it had no physical consequence for process or product[32].
Of course, a claimed invention which serves a "mechanical purpose that has useful results" is not unpatentable "merely because the purpose is in the carrying on of a branch of business"[33]. In relation to computers and computer‑related technology, it has been held in decisions of the Federal Court that a claimed invention will be a proper subject of letters patent if it has some "concrete, tangible, physical, or observable effect", as distinct from "an abstract, intangible situation" or "a mere scheme, an abstract idea [or] mere intellectual information"[34]. It has been held that an artificial state of affairs may also be created if the invention can broadly be described as an "improvement in computer technology", where the computer is integral to the invention, rather than a mere tool in which the invention is performed[35]. These propositions may be illustrated by reference to those decisions.
CCOM Pty Ltd v Jiejing Pty Ltd[36] concerned a claim for an invention which enabled a standard English keyboard to be used to generate Chinese characters for word processing purposes. The invention used a particular method of characterisation of character strokes which were applied to an apparatus in such a way that the operation of the keyboard would enable the selection through the computer of the appropriate Chinese characters. The Full Court (Spender, Gummow and Heerey JJ) held that the claimed invention was patentable subject matter. It was capable of being a manner of manufacture because it was concerned with a mode or manner of achieving an end result which was an "artificially created state of affairs of utility in the field of economic endeavour", that field being the use of word processing to assemble text in Chinese language characters[37]. The Full Court, in reaching its conclusion in favour of patentability of subject matter, referred with evident approval[38] to the observations of Graham J, delivering the decision of himself and Whitford J, in Burroughs Corporation's Application[39]:

The Full Court later noted in Grant that the invention claimed in CCOM included a "physically observable effect", being "the retrieval of graphical representations of desired characters for the assembly of text"[40], such that CCOM could be said to have fallen within a category of case in which, as an element of the invention, "there was a component that was physically affected or a change in state or information in a part of a machine"[41].
There is no issue that CCOM, as so explained, was correctly decided. As will be apparent from what will be said later in these reasons, there is nevertheless an aspect of the reasoning in CCOM which must be treated with caution in light of subsequent authority in this Court.
In contrast to CCOM, in Research Affiliates LLC v Commissioner of Patents[42], the Full Court (Kenny, Bennett and Nicholas JJ) held that a computer‑implemented business scheme for compiling a weighted index of securities using generic computer technology to produce an electronic file, for the purpose of determining how capital should be allocated, was not patentable subject matter. Similarly, a claim for a computer‑implemented method and apparatus for displaying information relating to one or more entities, and thereby providing business intelligence, was held in Encompass Corporation Pty Ltd v InfoTrack Pty Ltd[43] to be no more than "an instruction to apply an abstract idea (the steps of the method) using generic computer technology". A claim for a computer‑implemented method for linking a user to an advertising message by way of an intermediate engagement offer, involving a series of detailed processing steps, was also held not to be patentable subject matter in Commissioner of Patents v Rokt Pte Ltd[44].
Aristocrat accepts that Grant was correctly decided. It is important, therefore, to note in relation to Grant that the method the subject of the claim was not patentable subject matter even though it was reduced to written form and thus instantiated as a vendible product. The presentation of an idea or method or scheme - or the rules of a game - in written form is one of the most obvious (and among the most ancient) examples of common general knowledge. Thus the facilitation of card games by the use of packs of cards bearing visible symbols and values has for so long been part of common general knowledge that no one would suggest that a new variation of the rules of a game such as poker is patentable subject matter. In such a case, the well‑known pack of cards is put to a different use for the purpose of the new game; but no one would suggest that there is an invention because the only difference from the common general knowledge lies in the idea of the new game[45]. In the present case, the integers in claim 1 defining the core physical and hardware components, including computer components[46], do not disclose any departure from the common general knowledge as to the computerisation of games or gaming. As the parties agreed was part of the common general knowledge, most EGMs in 2014 were "distinguished from each other by the way in which features were introduced to utilise the physical or hardware components to provide different products that would engage and entertain users in different ways"[47]. As will become apparent later in these reasons, that carries significance in respect of whether the claimed invention is a manner of manufacture.

Pursuant to s 101F(4) of the Act, Aristocrat appealed from the delegate's decision to the Federal Court[48]. As noted above, that appeal was successful.
Before the primary judge, a large volume of expert evidence was adduced from a patent attorney, several gaming experts and Human Computer Interaction experts[49]. The primary judge used this evidence as an aid to construing the claim, noting that expert evidence in such cases should be used only to place the court in the position of a person acquainted with the surrounding circumstances as to the state of the art and manufacture as at the priority date[50].
The primary judge framed the "central question" as whether a claim for an EGM, which included a combination of physical parts and computer software to produce a particular outcome in the form of gameplay, is a manner of manufacture within s 18(1A)(a) of the Act[51]. As noted earlier, in accordance with the parties' agreement, the primary judge found it necessary to consider only claim 1 of the 967 patent to dispose of the matter[52].
The primary judge assumed, uncontroversially, that the requirements of novelty, innovative step and usefulness were met, and that there had been no secret use before the priority date[53]. His Honour then stated he was required to consider whether the claims in suit, as read in light of the specification as a whole and the relevant art, were for a manner of manufacture[54]. His Honour then, controversially, adopted a two‑step process: first, he asked whether the claimed invention was for a "mere scheme or business method of the type that is not the proper subject matter of a grant of letters patent"; and secondly, if that question were answered in the affirmative, he asked whether the computer‑implemented method is one where invention lay in the computerisation of the method, or whether the language of the claim involves "merely plugging an unpatentable scheme into a computer"[55]. The second inquiry would have involved consideration of whether the contribution of the claimed invention is "technical in nature" or solves a "technical" problem, or whether it merely requires "generic" computer implementation[56] - matters which were the subject of expert evidence[57]. His Honour proceeded to decide the issue of characterisation of claim 1 of the 967 patent by resolving the first of these questions in the negative.
The primary judge accepted that the core components of an EGM provide an interactive means of playing a game, and that the EGM described in claim 1 was "a device of a particular construction, known and recognised by those [skilled] in the art"[58]. Nevertheless, his Honour went on to find that the claimed invention was not a "mere scheme or plan" on the basis that it was "to a mechanism of a particular construction, the operation of which involve[d] a combination of physical parts and software to produce a particular outcome in the form of an EGM that function[ed] in a particular way"[59].
His Honour found that the invention as claimed included hardware, firmware and software components that were identified, particularly the display, credit input mechanism, gameplay mechanism and game controller. His Honour found that the expert evidence established that a skilled reader would understand, upon reading the specification, that EGMs are subject to regulatory supervision and standards imposing requirements across many areas. To a person skilled in the art, "the machine that is the subject of the claims is built to allow people to play games on it", where each of its physical and virtual components amounted to nothing more than a combination of features to create "a device of a specific character"[60].
The primary judge was influenced in his resolution of the first question in his two‑step process by the consideration that his approach advanced the social utility and value of innovation. His Honour observed that if claim 1 were to have been implemented mechanically in "the old‑fashioned way", using cogs, physical reels and motors to create the gameplay instead of software, there would undoubtedly have been a manner of manufacture because the combination of physical parts would be inseparable from the features of the game. His Honour considered that the utilisation of the efficiencies of electronic technology could not disqualify the invention from patent eligibility. To hold otherwise, his Honour observed, "would be antithetical to the encouragement of invention and innovation"[61].
His Honour considered that the claims in the case before him were analogous to those considered by the Federal Court in Aristocrat Technologies Australia Pty Ltd v Konami Australia Pty Ltd[62], where claims for an EGM had been held to amount to a manner of manufacture. Because Konami was not plainly wrong, his Honour considered himself obliged to follow it[63] in holding that the invention as claimed in claim 1 of the 967 patent was for a manner of manufacture[64]. It is noteworthy that the claims in Konami were for what were found to be "new and useful gaming machines and new and useful methods of operation producing new and improved results"[65]. Having found that the claimed invention was not a mere scheme, the primary judge considered it unnecessary to consider the second inquiry, so he did not make findings of fact to that effect.

The Full Court held that the primary judge erred in adopting his two‑step approach, and hence in his characterisation of the claimed invention.
Middleton and Perram JJ identified the question as whether the invention disclosed in claim 1 constituted patentable subject matter[66]. Their Honours noted that the feature game was an "abstract idea" that was not itself patentable, but recognised that an abstract idea may be patentable if it is physically embodied by an invention that gives it practical application[67]. Their Honours gave the example of a mechanical poker machine which allows a game defined by particular rules to be played, but emphasised that "the patent protects the invention which is the poker machine and not the abstract idea consisting of the game which it plays"[68]. Earlier decisions involving board or card games were cited in support of that approach[69].
Their Honours understood from claim 1 that integers 1.10‑1.12 were to be implemented by means of a computer program rather than by any mechanical apparatus, but noted that the integers of the claim did not disclose any particular computer program and did nothing more than call for the utilisation of a computer by the person implementing the invention[70]. In the upshot, their Honours held that integers 1.10‑1.12 (along with the game controller in integer 1.6) would not of themselves be a patentable invention, and none of the additional features in claim 1 could make it so, because claim 1 did not claim an advance in computer technology[71].
Middleton and Perram JJ considered that the formulation of the primary judge's first question did not involve any question of computer implementation, and that the second assumed that the scheme in question had been implemented in a computer. That is, the question whether the invention was, in truth, a computer‑implemented invention was never asked and consequently was never answered[72]. That was in error, their Honours held, because the invention proposed in the 967 patent was not so self‑evidently computer‑implemented that the issue did not require to be addressed[73].
Their Honours asked two questions: is the invention claimed a computer‑implemented invention; and if so, can the invention claimed broadly be described as an advance in computer technology[74]? As it happened, their Honours answered the first question in the affirmative, finding that an EGM is a computer and the feature game identified in integers 1.10‑1.12 is a computer‑implemented invention[75]. But their Honours' answer to the second question was "no". While their Honours said that some aspects of the 967 patent - being changes in the reel structure as identified in claim 3 and the idea of configurable symbols - may have been advances in gaming technology, they were not advances in computer technology. Fatal to the claim, in their Honours' view, was the circumstance that integers 1.10‑1.12 left it entirely up to the person designing the EGM to do the programming which gave effect to the game or games defined by those integers[76].
As to the primary judge's suggestion that if claim 1 had been for a mechanical poker machine it would have been patentable subject matter, their Honours said that the circumstance that a computer's only purpose is to give effect to abstract ideas embodied in the code which it executes, so as to "giv[e] life" to that abstract idea by that means, does not, without more, warrant the grant of a monopoly; it "would rather monopolise the abstract ideas thus embodied"[77]. The supposed anomaly that troubled the primary judge was, in their Honours' view, nothing more than a difference in the way that the implementation of abstract ideas has been approached by the courts given the availability of computer implementation. It may be said immediately that, in this respect, their Honours were clearly correct. It may readily be accepted that on the first occasion a mechanical poker machine was invented, it was patentable. But a later model of the same machine would not have been patentable simply because it allowed a new variant of poker to be played. That difference would not have relevantly differentiated it from the prototype[78].
The other member of the Full Court, Nicholas J, agreed that the appeal should be allowed, but reached his conclusion by asking whether the claimed invention produced an "artificially created state of affairs". The answer to that question was said to turn on whether the claimed invention "solves a technical problem or makes some other technical contribution to the field of the invention"[79]. His Honour declined to take an "excessively rigid or formulaic approach" to the question whether a computer‑implemented scheme is a manner of manufacture, especially where there may be no clear distinction between the field to which an invention belongs, and the field of computer technology[80].
Nicholas J accepted that "[m]ere business schemes" and abstract ideas or information have never been regarded as sufficiently tangible in character to constitute patentable subject matter, but said that they may become something patentable if the abstract ideas or information are given "practical effect and transformed into a new product or process which solves a technical problem, or makes some other technical contribution in the field of the invention"[81]. His Honour rightly said that Konami should be understood as a case in which a gaming machine or gaming system that could be seen to provide a technical solution to a practical problem in the field of gaming was proper subject matter of a patent[82].
His Honour considered that the two‑step approach adopted by the primary judge was erroneous because it failed to engage with the Commissioner's submission that the invention was a "mere scheme or set of rules for playing a game implemented using generic computer technology for its well‑known and well‑understood functions". In his Honour's view, the primary judge's approach failed fundamentally to address the question whether the EGM referred to in claim 1 was, or included, a computer and whether the invention was a computer‑implemented scheme or a set of rules governing the playing of a game[83].
Nicholas J observed that the specification did not identify any specific problem in the computer implementation of the new game to which the claimed invention was directed[84]. It merely described an EGM consisting of physical components that were common to such machines; neither that description, nor its capacity to trigger a feature game, was said to be anything new[85]. The instructions embodied in the game code that determined the course of the base game and the feature game represented "abstract information in the nature of a scheme or set of rules governing the playing of a game"[86]; that amounted to neither the required "artificial effect" nor an "unusual technical effect" because the code could not be regarded as transforming the way in which the EGM operated so as to make it patentable subject matter[87].
Nevertheless, Nicholas J had reservations as to whether the appeal to the Full Court could finally be determined and would have remitted the proceeding to the primary judge to determine whether claim 1 of the 967 patent "is a manner of manufacture on the basis that it involves technical and functional improvements to EGMs through the use of configurable symbols of the kind more fully described in the specification"[88].

Aristocrat accepted that mere schemes, plans or methods are not patentable subject matter as a manner of manufacture, but submitted that the Federal Court decisions post‑dating CCOM and Grant fell into, and perpetuated, error by developing "contrived constraints"[89] which anomalously fetter the patentability of inventions that utilise a computer.
Aristocrat also accepted that the assessment of manner of manufacture is to be undertaken, as a matter of substance, by reference to the subject matter of the claims and having regard to the utility of the claimed invention in the field of economic endeavour.
Aristocrat emphasised that claim 1 was not merely for a set of game rules, which it accepted was not patentable, but for a "combination of many elements that includes the functionality of the gaming machine". It was submitted that viewing the claim as a combination allows it to be assessed as a whole as a manner of manufacture. Aristocrat urged that this Court should not disturb the primary judge's finding of fact that the claimed invention was not a mere scheme.
In Aristocrat's submission, Research Affiliates and subsequent decisions[90] erroneously conflated the issue as to manner of manufacture with issues as to novelty and inventive step, thereby narrowing unjustifiably the conception of manner of manufacture. Aristocrat emphasised that each of the grounds of invalidity is distinct from the others. Aristocrat endorsed the primary judge's approach, emphasising the central importance of asking whether the claimed invention is a mere scheme separately from any question of inventiveness.
Aristocrat also submitted that the Full Court's decision in Research Affiliates inappropriately drew upon principles of patent law from the United Kingdom and the United States that did not translate to Australian law. Aristocrat deprecated the US approach as having "resulted in chaos", in preference for the "watershed" and "celebrated judgment" in NRDC.
Aristocrat argued that the approach of Middleton and Perram JJ relied on an understanding of "computer" that could "encompass, practically, any device containing a processor and memory", which would have "significant ramifications for industry" by excluding from patentability goods from digital clocks to writing instruments to "the whole Internet of Things". It was also said to produce the incoherence that the claimed invention is not patent‑eligible, but a mechanical equivalent would be.
In Aristocrat's submission, Nicholas J was right to hold that there was no requirement for an advance in the field of computer technology, but fell into error by adopting the approach in earlier Full Court decisions and equating an "artificially created state of affairs" with a "technical innovation, technical contribution or technical effect".

Myriad concerned product claims for an isolated nucleic acid which coded for, in the sense of having the potential to produce, an identified protein with mutations or polymorphisms indicative of a predisposition to breast and ovarian cancer. This Court held that the claim was not for a manner of manufacture and so was not a patentable invention.
The plurality said that the genetic information which was the substance of the claim was not invented by human action, but was a natural phenomenon discerned as a matter of discovery of a fact of the natural world[95]. In reaching that conclusion, their Honours emphasised that an invention is something which involves "making", whether that be a product, a process or an outcome which can be characterised as an "artificially created state of affairs"; and it must be brought about by human action[96]. The claim in Myriad failed to meet that requirement because satisfaction of an integer of the claim depended upon a discovery of a characteristic of the human being from whom the nucleic acid was isolated and not an invention of that characteristic by the person doing the isolating[97]. The point of principle of present relevance supported by that decision is that neither the discovery of a truth about the nature of things nor the devising of a scheme or game for entertainment is the invention of a manner of manufacture.
In addition, the plurality in Myriad said that the purpose of the Act would not be served by according patentability to a class of claims which by their very nature lack well‑defined boundaries or have negative or chilling effects on innovation[98]. Their Honours considered that there would be a "real risk" that the chilling effect of the claims "would lead to the creation of an exorbitant and unwarranted de facto monopoly on all methods of isolating nucleic acids containing the sequences coding for the [relevant] protein"[99]. Gageler and Nettle JJ expressed a similar concern[100], as did Gordon J[101]. It has been seen that the primary judge in the present case was influenced in his characterisation of the subject matter of the claim by a concern that too "narrow" a characterisation might be "antithetical to the encouragement of invention and innovation"[102]. His Honour's concern is offset by the consideration that the characterisation of the invention favoured by his Honour carries with it the risk of chilling innovation by excluding competitors from this field of the gaming business.
NRDC held that a new use of an old product may be a method that is patentable if it is itself an invention. In NRDC, the manner of manufacture in question, methods for the eradication and control of weeds by the application of a known herbicide, was patentable as an invention because it produced the economically beneficial effect of a new use of the particular chemical compound, as distinct from the earlier, and different, economic effect from a different use of that compound[103]. It is necessary to appreciate that NRDC is not authority for the proposition that a claim for a new use of an old product may confer a patent monopoly over the old product. In such a case, the old product is, in light of the prior art, not relevantly a manner of manufacture that can be said to have been invented by the claimant. NRDC does not support the view that new, but unpatentable, subject matter presented or operated through generic technology is patentable[104]. It is important to appreciate that to say this is not to err, as Aristocrat claims, by conflating the issue of manner of manufacture with issues of novelty and inventive (or innovative) step.
In N V Philips Gloeilampenfabrieken v Mirabella International Pty Ltd[105], Brennan, Deane and Toohey JJ referred to s 18(1) of the Act as identifying "the essential characteristics of a 'patentable invention' for the purposes of the Act". Focussing upon the introductory words of that sub‑section, their Honours upheld the approach of the primary judge and the Full Court in that case, whereby "independently of the specific provisions of s 18(1)(b) relating to novelty and inventive step, s 18(1)(a) must be read as containing a threshold requirement to the effect that what was claimed as a patentable invention must be a proper subject of letters patent according to the principles which have been developed for the application of s 6 of the Statute of Monopolies 1623 (Imp)"[106]. In characterising a claimed invention for this purpose, one does not trespass impermissibly into issues of novelty or obviousness by focussing on the features of the claimed invention that differentiate it from the common general knowledge. These are the features which enable one to identify what is said to be the "invention" for the purposes of s 18(1) and s 18(1A) of the Act.
Brennan, Deane and Toohey JJ went on to hold that "if it were apparent on the face of the specification, when properly construed and understood, that a subject process was (for example) nothing more than a new use of an old product, the specification would itself disclose the absence of 'an alleged invention' within the second limb of the definition [of the term 'invention']", and in such a case the Commissioner "was entitled to reject the application for the reason that it failed to satisfy the threshold test". Their Honours specifically rejected the proposition "that s 18(1)(b)'s requirements of novelty and inventive step (when compared with the identified applicable prior art base) are exclusive and exhaustive in so far as inventiveness (whether of step or idea) is concerned"[107].
Brennan, Deane and Toohey JJ emphasised the primary significance of the words "a patentable invention is an invention that ..." in s 18(1), as it then stood, as words which "impose a threshold requirement which must be satisfied before one reaches that contained in the body of par (a)"[108], that being the requirement of manner of manufacture. Their Honours explained[109]:

"It is true that it can be argued that there is internal tension in an overall legislative scheme which imposes a threshold requirement of inventiveness reflecting the effect of the saving clause in s 6 of the Statute of Monopolies and then proceeds, if that threshold requirement be satisfied, to impose more specific requirements of novelty and inventive step. It seems to us, however, that there are several answers to that argument. One is that there is no construction of s 18(1) of the Act which is not susceptible of some legitimate criticism. Another is that traditional patents law under s 6 of the Statute of Monopolies long recognised cumulative requirements of an element of invention (as distinct from, eg, mere discovery or analogous use) in the subject matter as described by the specification and novelty or newness as disclosed by comparison with a prior art base[118]. The distinctive requirements of novelty and inventive step required by s 18 of the Act are emphasised by their elaboration in s 7. In that regard it may be noted that in the [Patents Act 1952 (Cth)] one of the grounds for revocation of a patent was that the invention 'was obvious and did not involve an inventive step, having regard to what was known or used in Australia' (s 100(1)(e)). More important, it seems to us to be highly unlikely that it was the legislative intent that there should be a significant alteration of the law as explained in Microcell by extending the ambit of a patentable invention so as to include what is 'nothing more' than 'the use of a known material in the manufacture of known articles for the purpose of which its known properties make that material suitable'. In that regard, we do not accept the argument on behalf of Philips that Microcell was decided on the question of newness and not on manner of manufacture. It is true that, in Microcell, 'counsel for the applicants argued that ... they were required to show no more than that the specification described a manner of manufacture and that it was alleged to be new'. But it is clear that the decision of the Court was that '[t]he specification in the present case does not, in our opinion, disclose a patentable invention'. Rather, the deliberate retention of the established definition of 'invention' in the Dictionary in Sch 1 strongly supports the view that it was the legislative intent that the threshold requirement of 'an invention' would continue to exclude from a 'patentable invention' any claimed process, method or use which was not, on the face of the specification, a proper subject of letters patent according to traditional principles."

In accordance with the approach in Myriad[122], it is necessary to characterise Aristocrat's claimed invention by reference to the terms of the specification having regard to the substance of the claim and in light of the common general knowledge. In the absence of a claim to some variation of or adjustment to generic computer technology to give effect to, or accommodate the needs of, the new game, there is no reason to characterise the claimed invention as other than a claim for a new system or method of gaming: it is only in relation to the feature game that the invention is claimed to subsist. The title of the 967 patent and the field of invention described in the patent specification accurately characterise the invention claimed by Aristocrat. The claimed invention takes its character, as an invention, from those elements of the claim which are not common general knowledge. If that were not so, every EGM conforming to the generic physical and hardware components, including computer components, described in the claim would be patentable simply because it, like every other EGM, allowed a new game to be played. And the only thing differentiating each new claimed invention, as an invention, would be that unpatentable game.
Unlike CCOM, the present cannot be said to fall within a category of case in which, as an element of the invention, "there [is] a component that [is] physically affected or a change in state or information in a part of a machine"[123].
All members of the Full Court were right to conclude that the subject matter of Aristocrat's claim is not patentable subject matter. It is common ground that the new game devised by Aristocrat, as an idea, is not itself patentable subject matter; and there is nothing in claim 1 that might lead to the conclusion that it has produced some adaptation or alteration of, or addition to, technology otherwise well‑known in the common general knowledge.
Neither the primary judge nor the Full Court made any finding that any of the integers of claim 1 addressed the exigencies of the physical presentation of the operation of the game devised by Aristocrat. And it is not apparent from the terms of the specification of the 967 patent or claim 1 itself that there is a basis for such a finding. In the absence of such a finding, there is no basis for concluding that the claimed invention is patentable subject matter. It is no more than an unpatentable game operated by a wholly conventional computer, using technology which has not been adapted in any way to accommodate the exigencies of the game or in any other way.
Two aspects of the reasons of Middleton and Perram JJ warrant comment. First, the two‑step analysis proposed by their Honours unnecessarily complicates the analysis of the crucial issue. As explained in Myriad[124], the crucial issue is as to the characterisation of the invention by reference to the terms of the specification having regard to the claim and in light of the common general knowledge. It is not apparent in the present case that asking whether the claimed invention is an advance in computer technology as opposed to gaming technology, or indeed is any advance in technology at all, is either necessary or helpful in addressing that issue. As Nicholas J explained, the issue is not one of an "advance" in the sense of inventiveness or novelty. In conformity with the decision in N V Philips, the issue is whether the implementation of what is otherwise an unpatentable idea or plan or game involves some adaptation or alteration of, or addition to, technology otherwise well‑known in the common general knowledge to accommodate the exigencies of the new idea or plan or game.
Secondly, the suggestion by Middleton and Perram JJ that the claimed invention may be an advance in gaming technology but not an advance in computer technology was an unnecessary flourish. This observation might be thought to reject the notion that an advance in gaming technology may be patentable subject matter. That would be erroneous. The flourish was unnecessary because there is no reason to conclude from the terms of claim 1 of the 967 patent that it was claiming an advance in gaming technology other than the use of a generic computer to play its new game. It was also neither necessary nor appropriate to speak of advances in gaming technology where one is concerned with a claimed invention that discloses no adaptation or alteration of, or addition to, apparatus well‑known in common general knowledge in order to accommodate the exigencies of the new idea. As Nicholas J appreciated, a new idea implemented using old technology is simply not patentable subject matter[125]. It may be noted here that the claim does not disclose any basis on which one might conclude otherwise. On that basis, there was no occasion for the Full Court to consider remitting the proceeding to the primary judge to enable findings to be made as to whether the claimed invention made any technical contribution to the common general knowledge of computerised gaming. Nicholas J had no sufficient reason to think that the remitter he proposed was necessary or appropriate.
During the course of argument in this Court, a question arose as to the significance of the configurable symbols, which are referred to in integers 1.6‑1.12. Claim 1 does not disclose that the configurable symbols somehow facilitate the implementation of the game by the EGM in any way different from a generic EGM. There is nothing in the claim over and above an instruction to provide configurable symbols, an instruction which a person skilled in the art could be expected to act upon in the exercise of his or her own judgment, in light of the common general knowledge. Put another way, there is nothing new or inventive about the interaction between the configurable symbols and the game[126].
There is also nothing disclosed in the claim in the specification to suggest that the configurable symbols have any function or physical presentation that differentiates the claimed invention from a generic EGM. As was said in Calidad Pty Ltd v Seiko Epson Corporation[127], the price for the monopoly rights conferred by a patent "is that the invention must be disclosed in the patent".
In this regard, the claim is of central importance in the definition of a patentable invention[128]. As Lord Russell of Killowen observed in 1938, the function of a patent claim is "to define clearly and with precision the monopoly claimed, so that others may know the exact boundaries of the area within which they will be trespassers"[129]. As the primary judge found, the EGM described in the claim is "a device of a particular construction, known and recognised by those [skilled] in the art"[130]. Nothing in the reasons of the primary judge suggests that his Honour was invited to find that the configurable symbols should be regarded as standing outside this conclusion.

Aristocrat submitted that should this Court reject its primary contention, the matter should be remitted to the primary judge for determination of the issue whether the claimed invention involved a technical contribution, including in the field of gaming technology. Aristocrat, in its reply in oral argument, sought leave to amend its notice of appeal to assert that Middleton and Perram JJ erred in failing to remit the proceeding to the primary judge to consider whether claim 1 of the 967 patent is a manner of manufacture. As discussed above, the primary judge expressly declined to make findings that the claimed invention made any technical contribution in the sense of involving the creation of an artificial state of affairs[131]. To the extent that Aristocrat seeks now to embrace the reservations of Nicholas J as to the final disposition of the matter, that course should not be entertained.
Although the Commissioner did not oppose Aristocrat's application, she submitted that it would be futile to grant it. As these reasons have explained, the Commissioner was correct to submit that the essential question is to characterise the invention, an inquiry which is conducted by reference to the claim in light of the specification as a whole and the common general knowledge.
Claim 1 of the 967 patent does not disclose any technical contribution to either computer or gaming technology outside the common general knowledge. At best, the claimed invention contains a new game which may enhance player enjoyment[132]; but that cannot be said to amount to a technical contribution or to solve a technical problem in the field of computer or gaming technology. In addition, special leave was granted in this matter on the footing that the appeal would resolve issues of legal principle that were ripe for determination. An appellant in such a case should not expect to be allowed to expand its appeal to extend the final resolution of the matter by remitting it for further litigation of issues of fact not adverted to when special leave was being sought.
Aristocrat's application for leave to amend its notice of appeal should be refused.

An electronic gaming machine ("EGM") is a device that was described in expert evidence in this case as a "video slot machine"[138]. An EGM typically has a player interface by which players input money into the machine, make wagers, and play the game. The appellant, Aristocrat Technologies Australia Pty Ltd ("Aristocrat"), claimed innovation patents under s 18(1A) of the Patents Act 1990 (Cth) concerning various embodiments of an EGM, including one that incorporated a standard player interface integrated with, and governed by, the hardware and software of an electronic game controller which included feature games and configurable symbols.
The only question on this appeal is whether the claim by Aristocrat[139] is not the proper subject matter of a patent because it is not a manner of manufacture within s 6 of the Statute of Monopolies as required by s 18(1A)(a) of the Patents Act. Before the primary judge in the Federal Court of Australia, in a concession that was rightly never revoked on appeal to the Full Court of the Federal Court of Australia or to this Court, the Commissioner accepted that if the relevant claim had involved a mechanical implementation "using cogs, physical reels and motors to create the gameplay" then there would have been no doubt that the relevant claim was a manner of manufacture[140]. The primary judge held that the electronic and digital nature of an EGM made no difference to that conclusion. The Full Court unanimously allowed an appeal. Two members of the Full Court held that a claim that involved a "computer‑implemented invention" could only be a manner of manufacture if it could broadly be described as an advance in computer technology.
In the 21st century, a law such as s 18(1A) of the Patents Act that is designed to encourage invention and innovation should not lead to a different conclusion where physical cogs, reels, and motors are replaced by complex software and hardware that generate digital images. Throughout this litigation, the Commissioner attempted to avoid such a curious result by re‑characterising Aristocrat's claim as a mere scheme or abstract idea. The Commissioner could only achieve that characterisation by filleting from the claim essential and interdependent integers providing for the implementation of the game on the EGM. The integers stripped from the Commissioner's characterisation included components as basic as the display component of the player interface on which the images of symbols generated by the software and hardware appeared.
For the reasons below, the appeal must be allowed.

The starting point for any assessment of whether an applicant has satisfied the requirements of s 18(1) or, as in this case, s 18(1A) is characterisation of the relevant claim. Section 18(1A), like s 18(1), requires answers to questions such as: "is the subject matter an alleged invention?"; "is the alleged invention a manner of manufacture?"[141]; "is the alleged invention novel?"[142]; "does the alleged invention involve an innovative step?"[143]; "is the alleged invention useful?"[144]; and "was the alleged invention secretly used?"[145] None of these questions can be answered without first characterising the claim, which involves answering the fundamental question of "what is the subject matter of the claim"? Relatedly, it also involves asking "what are the facts and matters which are relied upon to justify a conclusion that the claim contains an invention?"[146]
The characterisation of the claim must be undertaken as a matter of substance, not mere form[147]. It requires consideration of all of the integers of the claim in light of the relevant facts and matters in the specification. The exercise of characterisation might reveal an alleged invention which may be either a process or a product.
The characterisation exercise should not be artificial. An artificially specific characterisation could confine any claim to a mere intellectual idea, which, as is explained below, could deny an obvious manner of manufacture by ignoring the means of implementing the idea. Similarly, an artificially generalised characterisation could remove the element of novelty or inventiveness from any claim.
The risk of artificially characterising a claim is particularly pronounced where the claim contains interdependent integers. Unless a claim asserts a monopoly "in any integer by itself", it is "only necessary that each integer form part of a full description of the invention"[148]. As will be explained below, the claim which is the subject of this appeal did not assert a monopoly in any single integer; the claim relied upon the full description of the alleged invention. In Minnesota Mining and Manufacturing Co v Beiersdorf (Australia) Ltd[149], Aickin J referred to such a circumstance as a "combination patent" where:

Once the subject matter of the claim has been characterised, and the facts and matters relied upon for that characterisation are identified, there is a threshold question of whether the subject matter can meet the description of an alleged invention within Sch 1 to the Patents Act. This threshold question was most clearly expressed in N V Philips Gloeilampenfabrieken v Mirabella International Pty Ltd[150].
In N V Philips, a purported invention characterised as a "low‑pressure mercury vapour discharge lamp" had been held by the primary judge and a majority of the Full Court of the Federal Court of Australia not to be a patentable invention because it was merely a new use of a known product, namely using the known luminescent properties of phosphors in a lamp[151]. On appeal to this Court, the appellants submitted that this reasoning impermissibly imposed a threshold requirement for "newness" separately from the independent requirement of novelty in s 18(1)(b)(i)[152].
A majority of this Court in N V Philips, Brennan, Deane and Toohey JJ, dismissed the appeal. Their Honours held that the reference to a "patentable invention" in the prefatory words in s 18(1), read in light of the definition of "invention", imposed a threshold requirement for an "alleged invention" requiring a minimal level of "newness" and "inventiveness" before something could be a patentable invention[153]. As the language ("so far as claimed in any claim") of s 18(1) illustrates, that threshold requirement is to be assessed by reference to the face of the claim in the context of the specification rather than, as ss 18(1)(b)(i) and 18(1)(b)(ii) read with s 7 require for the independent requirements of novelty and inventiveness, by reference to the prior art base[154]. Without satisfaction of that threshold requirement, there can be no manner of manufacture as required by s 18(1)(a)[155].
In recognising the threshold requirement, the majority in N V Philips[156] relied upon the earlier decision of this Court in Commissioner of Patents v Microcell Ltd[157], in which a claim characterised as a self‑propelled‑rocket projector was refused on the basis that on the face of the specification it was nothing more than "the use of a known material in the manufacture of known articles for the purpose of which its known properties make that material suitable".
In N V Philips, Dawson and McHugh JJ dissented, saying that it was "scarcely to be thought that the legislature, in closely defining the context for consideration of the questions of novelty and inventiveness, intended that those or related questions should otherwise remain, and remain at large"[158]. Later, this Court in Lockwood Security Products Pty Ltd v Doric Products Pty Ltd [No 2][159] also denied that the decision in Microcell involved a threshold test. Nevertheless, in D'Arcy v Myriad Genetics Inc[160], French CJ, Kiefel, Bell and Keane JJ confirmed, citing N V Philips, that an "anterior exclusion" may arise "based upon an admission, on the face of the specification, which makes clear that the invention claimed is not novel or does not involve an inventive step". Similarly, Gordon J, also citing N V Philips, said that the "primary or threshold requirement of a 'patentable invention' is that it be an 'invention'"[161].
Whatever controversy may remain as to the threshold requirement for an alleged invention, the decision in Microcell and the remarks in D'Arcy v Myriad Genetics Inc demonstrate that the threshold is low. Further, the threshold necessarily imposes a less stringent requirement than the independent requirements of novelty and inventiveness in ss 18(1)(b)(i) and 18(1)(b)(ii) read with s 7. Like those provisions, the threshold should not be assessed in hindsight: "[t]he opening of a safe is easy when the combination has been already provided"[162]. And, when assessing this threshold question without the benefit of expert evidence as to prior art, it is important to "remember warnings" that "[the] Court should be careful to avoid assuming a technical expertise it does not have"[163].

This reasoning applies equally where the idea consists of the rules of a game. Although the rules of a game alone are not the proper subject matter of a patent, they may be the proper subject matter when combined with physical materials used for playing the game. In Re Cobianchi's Application[176] an idea for a new way of playing the game of "Canasta" with differently marked cards was held to be a manner of manufacture. Lloyd‑Jacob J, the first specialist British patent judge[177], held that "the game itself, whatever its ingenuity, could not be the subject of patent protection" but that the new pack of cards, "which requires the operation of a manner of manufacture for its reproduction", could not be "dismissed as a mere idea or plan"[178].
In the 21st century, it would be absurd if the application of this principle were any different where the idea of the game is combined with a digital representation rather than a cardboard representation of the game. For instance, as senior counsel for the Commissioner properly accepted on this appeal, the game of Monopoly is patentable subject matter where it is embodied in a physical form such as a designed cardboard board, dice, and playing characters. It could not possibly be the case that the game of Monopoly ceases to be patentable subject matter if the graphics are displayed on a machine rather than on cardboard. To treat the two differently on the basis that the digital representation does not involve a physical transformation of something would plainly be to allow form to triumph over substance. As Heerey, Kiefel and Bennett JJ said in Grant v Commissioner of Patents[179], "[a]n application is not limited to a physical transformation". Rather, the requirement of a "physical effect" includes "a concrete effect or phenomenon" and extends to "a change in state or information in a part of a machine"[180].
However, it is not enough that the scheme involves the use of a machine to manipulate abstract ideas. Where the manner of manufacture relies upon some change in state or information in a machine, then that change must produce an artificial state of affairs and a useful result[181]. Thus, as Emmett J said in Dynamite Games Pty Ltd v Aruze Gaming Australia Pty Ltd[182], although a mathematical formula is not the proper subject matter of a patent, "if the claim is not for a mathematical formula in the abstract, but rather a way of using the mathematical formula in a process for producing particular products, there may be a patentable invention".
Numerous examples can be given where the proper characterisation of the claim is one that merely involves the use of a machine to manipulate an abstract idea rather than involving the implementation of the idea on a machine to produce an artificial state of affairs and a useful result. An idea that uses a computer, but does not generate some artificial state of affairs, remains no more than an idea. In Grant v Commissioner of Patents[183], a scheme for protecting assets from unsecured judgment creditors was not the proper subject matter of a patent although the scheme involved the use of a computer. In Research Affiliates LLC v Commissioner of Patents[184], a scheme for constructing data concerning a non‑capitalisation weighted portfolio of assets was not the proper subject matter of a patent although it involved the use of a computer to access and process the data and to apply a weighting function. In Commissioner of Patents v RPL Central Pty Ltd[185], a scheme for assessing the competency or qualification of people in accordance with recognised standards was not patentable subject matter merely because it involved the use of a computer. In Encompass Corporation Pty Ltd v InfoTrack Pty Ltd[186], a method and apparatus for displaying information to provide "business intelligence" was not the proper subject matter of a patent because, in substance, it was "no more than an instruction to apply an abstract idea (the steps of the method) using generic computer technology". No particular software was an essential feature of the invention[187]. In Commissioner of Patents v Rokt Pte Ltd[188], a marketing scheme did not become patentable subject matter merely because it happened to be digital and therefore involved the use of a computer. It involved "computer technology that is utilised for its basic, typical or well‑known functions"[189].
Although there was no artificial state of affairs created in any of these cases, and the results in all of these cases are plainly correct, some of the statements explaining the results in these and other cases must be read in the context of what was being decided. For instance, one expression of the characterisation question in some of the cases was whether the implementation of the scheme could be described as "an improvement in computer technology"[190]. A better way of expressing the point in such cases, consistent with the ultimate single question of whether there is a manner of manufacture within s 6 of the Statute of Monopolies, would be to ask whether, properly characterised, the subject matter that is alleged to be patentable is: (i) an abstract idea which is manipulated on a computer; or (ii) an abstract idea which is implemented on a computer to produce an artificial state of affairs and a useful result. The artificial state of affairs and useful result may be a physical change in something, but it need not be. The artificial state of affairs may be an improvement in computer technology, but it need not be. It is enough that the artificial state of affairs and useful result are created by "the way in which the method is carried out in the computer"[191].
Further, the method of carrying out the idea in the computer, and the artificial state of affairs and useful result, need not be inventive or ingenious. The ingenuity may lie only in the idea but, when the idea is applied to produce an artificial state of affairs and a useful result, there will be a manner of manufacture. As this Court said in National Research Development Corporation[192]:

By contrast with the examples above in which a computer was merely used to manipulate an abstract idea, an example of an idea implemented on a computer to produce an artificial state of affairs and a useful result is the invention in CCOM Pty Ltd v Jiejing Pty Ltd[193]. In that case, the Full Court of the Federal Court of Australia held a claim to be the proper subject matter of a patent where it was characterised as one that enabled, through the operation of a computer keyboard, the selection of Chinese characters for word processing. The invention was one that implemented changes to the hardware and software of a computer in carrying out the idea. It was not merely the use of a computer to manipulate the abstract idea. The Full Court correctly held that it was not necessary that there be "anything new and unconventional in computer use"[194]. Although there might be doubt about whether CCOM sufficiently recognised the threshold requirement for an invention[195], the reasoning in CCOM as to manner of manufacture has never been doubted and has been approved on many occasions in the Federal Court[196], including in recognising as a manner of manufacture the results produced by the application of computer programs in EGMs[197].
Another example of a computer carrying out a method to produce an artificial state of affairs and a useful result, rather than merely manipulating an abstract idea, is a decision of the Patents Appeal Tribunal in Burroughs Corporation (Perkins') Application[198]. In that case, Graham J, delivering the judgment of himself and Whitford J, held that a proper subject matter for a patent was an idea that was implemented in a computer program to make a "slave computer" interrupt the operations of a "central computer". A manner of manufacture existed in the artificial state of affairs of "an old machine giving a new and improved result", since "[i]f the bare method or idea is also clothed ... with a practical garment in the shape of apparatus enabling that method or idea to be realised in practice, it should no longer be regarded as a naked conception, for it has found a practical embodiment in the apparatus"[199].
The decision in Burroughs Corporation (Perkins') Application reflects long‑established principle. It was quoted with approval by Heerey, Kiefel and Bennett JJ in Grant v Commissioner of Patents[200]. It was cited with approval in CCOM[201]. And it was relied upon in International Business Machines Corporation v Commissioner of Patents[202], where Burchett J concluded that the application of mathematical methods to a computer to produce an image of a desired curve was the proper subject matter of a patent.

A characteristic of some of the Australian decisions in relation to the patentability of ideas implemented through the use of computers has been a focus upon overseas authorities in which similar questions have arisen. It is necessary to explain why this is an area where overseas authorities are, at best, of limited assistance and, at worst, dangerously misleading.
As to the United Kingdom, in CCOM[203] the Full Court emphasised the need to take care when referring to decisions under the Patents Act 1977 (UK). Following that legislation, the Jacobean Statute of Monopolies that underpinned, and still underpins, the terms of manner of manufacture in Australia "no longer supplies a criterion for patentability in the British legislation". In Aktiebolaget Hässle v Alphapharm Pty Ltd[204], four members of this Court spoke of the "failure in an appreciation" in the lower courts of the divergence between Australian case law and United Kingdom case law. And in Lockwood Security Products Pty Ltd v Doric Products Pty Ltd [No 2][205], this Court reiterated the divergence between the Australian and the United Kingdom patent systems and the "shift in grundnorm" after the enactment of the Patents Act 1977 (UK) following the Convention on the Grant of European Patents (1973). Following that shift, and in light of the concern in Art 52 of the Convention for "all fields of technology", the concept of a contribution having a "technical character" has featured as a requirement for an invention in decisions of the EPO Technical Board of Appeal and the courts of the United Kingdom[206].
As to the United States, s101 in Title 35 of the United States Code is expressed in very different terms from s 18 of the Patents Act. It relevantly provides that "[w]hoever invents or discovers any new and useful process, machine, manufacture, or composition of matter, or any new and useful improvement thereof, may obtain a patent therefor ...". Unsurprisingly, in cases that might otherwise have provided comparators with the circumstances of this case the focus is upon the question of whether there is any "new and useful improvement" in a machine or other technology[207].

As the specification explains, the EGM described in Claim 1 is a combination of the game controller and the player interface which enables manual interaction between the player and the EGM. Integers 1.1 to 1.5 mostly describe the physical features of an ordinary EGM, and are generally part of the player interface. Integers 1.6 to 1.12 interact with the physical features of the player interface and are components of what is described as a "game controller".
The player interface in integers 1.1 to 1.5 includes mechanisms to enable the player to input credits and receive payouts; one or more displays; a game play mechanism such as a touch screen or buttons; and speakers. The game controller is a combination of integrated hardware and software typically including a processor, memory which stores instructions and data for the processor, hardware meters to monitor player credit and ensure regulatory compliance, a random number generator, and an input/output interface to communicate with the player interface. The game controller communicates with the player interface by a processor that processes the player's instructions in accordance with game play rules and sends outcomes to the display. The processor is any device that can receive and process inputs in accordance with instructions stored in memory and generate outputs. It may include: a microprocessor, microcontroller, programmable logic device or other computational device, a general-purpose computer (eg a PC), or a server.
In the embodiments described in the specification, a player makes a wager and starts playing the base game. The symbol selector uses the random number generator to select symbols from the symbol data. The symbol data stores both configurable symbols (symbols which can be configured during the game to change the value of the prize) and non‑configurable symbols. The selected symbols are sent to the display controller, which then displays the symbols on the player interface display.
The pictures below illustrate the configurable symbols in one embodiment described in the specification. The configurable symbols each have a common component: a pearl symbol (marked 902). The configurable symbols also have a variable component: the numbers that overlay the configurable symbol and indicate the value of the prize associated with it (marked 904). The prize value is assigned to the configurable symbol by an electronic value assigner which draws on prize value data.
During the base game, an outcome evaluator determines whether a "trigger event" has occurred, such as the display of a particular number of configurable symbols. If a trigger event occurs, then a feature game will begin. The combined prize value of the configurable symbols at the end of the base game will have been won by the player. Those configurable symbols will be held in their respective display positions during the feature game. The player can then win additional prizes from configurable symbols in the feature game.
In the feature game, the outcome generator causes the feature game to be displayed by retrieving symbol data and passing the data to the display controller. As in the base game, the symbol selector selects symbols to be displayed in the display positions that are not otherwise displaying a configurable symbol. The outcome evaluator monitors the play of the feature game. If at least one configurable symbol is displayed, then that symbol will be held on the reel and the configurable symbol counter (marked 810) will be increased. If a predefined number of configurable symbols are displayed on the reels, a jackpot will be paid.
It is apparent that two important elements of the claim, as described in the specification, are the configurable symbols and the feature games, which are part of the game controller. There was expert evidence before the primary judge that the configurable symbols, particularly the prize values overlaid on them, are a significant enhancement of a player's experience[208]. Both the configurable symbols and the feature games require implementation in the EGM. In the operation of the EGM, they interact with, and are entirely dependent upon, other integers of the claim, especially the physical integers. They are inextricably connected with the player interface. For instance, the configurable symbols and feature games operate by reference to modules stored in memory and implemented by the processor, namely: the outcome generator comprising the symbol selector, value assigner and rule modifier; the outcome evaluator; and the display controller.

The Delegate of the Commissioner characterised Claim 1 as a feature game in which configurable symbols from a main game were retained but non‑configurable symbols were removed and replaced with other configurable or non‑configurable symbols, with a prize at the end of the feature game based on the values displayed on the configurable symbols. Based on this characterisation, the Delegate found that Claim 1 was merely a "game rule" and was not a manner of manufacture. The Delegate revoked the 967 patent as well as the three other patents in issue.
The primary judge (Burley J) rejected the characterisation of Claim 1 by the Delegate. The primary judge explained that the Delegate's characterisation was based upon the error of first identifying the "inventive concept" and using that to characterise the claim as a mere scheme[209]. As the primary judge correctly observed, "[a]ny claim can be stripped back to remove all specific limitations, so that at its core an abstract idea emerges"[210]. The primary judge characterised Claim 1 as "a machine of a particular construction which implements a gaming function ... [T]he physical and virtual features of the display, reels, credit input mechanism, gameplay mechanism and game controller combine to produce the invention."[211]
In determining whether Claim 1, so characterised, was a manner of manufacture, the primary judge applied a two‑stage test involving an "initial question" of whether the claimed invention was for "a mere scheme or business method" that is not the proper subject matter of a patent. If so, there was said to be a "subsequent inquiry" as to "whether the computer‑implemented method is one where invention lay in the computerisation of the method" or whether it involved "merely plugging an unpatentable scheme into a computer"[212]. The primary judge concluded, however, that Claim 1 was not a mere scheme and that it was, on its proper characterisation, a manner of manufacture.
The Full Court allowed an appeal. Two members of the Full Court (Middleton and Perram JJ) began - with respect, correctly - by identifying the critical issue as the proper characterisation of the invention based upon the construction of Claim 1[213]. Their Honours considered that the primary judge had characterised Claim 1 as being "solely the EGM itself"[214]. Middleton and Perram JJ preferred a characterisation which accounted for both the EGM and the feature game, namely: a "feature game implemented on [a] computer which is an EGM"[215].
Middleton and Perram JJ rejected the two‑stage approach of the primary judge. As their Honours observed, that approach has the potential to convert the proper enquiry - is the invention patentable subject matter? - into a different question which asks whether the invention is a scheme[216]. In place of the approach of the primary judge, Middleton and Perram JJ proposed two different questions: (i) is the invention claimed a computer‑implemented invention?; and (ii) if so, can the invention claimed broadly be described as an advance in computer technology? If the answer to (i) is "no", the general principles of patentability must be considered. If the invention is computer‑implemented but the answer to (ii) is "no", then the invention is not patentable subject matter[217].
Middleton and Perram JJ applied this approach to their characterisation of Claim 1 to conclude that Claim 1 was not the proper subject matter of a patent. The claim was for a feature game implemented by a computer and, although their Honours reasoned that the configurable symbols "may constitute advances in gaming technology", their Honours declined to equate advances in gaming technology with advances in computer technology[218].
Nicholas J agreed with Middleton and Perram JJ that the appeal should be allowed and that the orders of the primary judge should be set aside. His Honour characterised Claim 1 in a similar manner to Middleton and Perram JJ, referring to both the "physical components that are common to [EGMs]" and the operation of the "gaming machine ... which seeks to enhance player enjoyment by offering a feature game that may be triggered during play of the base game"[219]. However, his Honour did not adopt Middleton and Perram JJ's proposed new test, holding instead that a manner of manufacture required that an abstract idea "has been transformed in some definite and tangible way so as to result in a product or method providing the required artificial effect"[220]. In an earlier decision, Nicholas J had held that a "new and useful" feature game including a claim involving a random prize awarding feature implemented by an EGM was a manner of manufacture[221]. In the present case, his Honour held that Claim 1 was not a manner of manufacture because the specification did not "identify any technological problem to which the patent purport[ed] to provide a solution"[222]. Nevertheless, Nicholas J, dissenting on this point, would have remitted the matter to allow the primary judge to consider whether the invention involved technical and functional improvements to EGMs[223].

It was common ground on this appeal that integers 1.1 to 1.6 were, as a matter of common general knowledge, components of generic EGMs. If the proposed invention the subject of this appeal were characterised by exclusively focusing upon those integers, as a "gaming machine" or EGM, it would not be patentable. The claim would fail at the threshold stage. It would not display even the minimal degree of novelty and inventiveness required for it to be an alleged invention.
Such a characterisation would be absurdly and artificially generalised. It would entirely ignore the integers of Claim 1 that provide its alleged novelty and inventiveness; in particular, core features of the game controller in integers 1.7 to 1.12 including the configurable symbols and feature games were, emphatically, not part of common general knowledge. At no stage in this litigation has such a generalised characterisation been proposed by any party. Contrary to the views of Middleton and Perram JJ in the Full Court, the primary judge's characterisation was not so generalised. His Honour had focused upon the gaming function that was implemented as well as the gaming machine. Hence, neither before the primary judge in the Federal Court, the Full Court, nor this Court did the Commissioner suggest that Claim 1 must fail at the threshold stage for reasons of complete lack of novelty or inventiveness.
At the other extreme, of characterisation which is artificially specific, Claim 1 might be characterised by reference only to those elements that are deduced from the specification to involve alleged novelty and inventiveness. Although the Delegate characterised Claim 1 by reference only to the configurable and non‑configurable symbols, neither the primary judge nor any member of the Full Court characterised Claim 1 in such an artificially specific manner. Such a characterisation should not be accepted. At that level of specificity, the characterisation entirely ignores other elements of the game controller and the whole of the player interface, which is interdependent with the game controller.
In this Court, the Commissioner's characterisation was also extremely specific and narrow. The Commissioner described Claim 1 as no more than "an instruction to carry out an electronic game, using conventional computer technology for its well‑known and well‑understood functions". That characterisation might encompass most integers of the claim concerning the game controller, but it ignores entirely the interaction between the instructions and those integers concerned with the player interface.
By contrast, the various characterisations proposed by Aristocrat in this Court have the common feature of reiterating the elements of Claim 1, but without describing the essence of the claim. Characterisation at the proper level of generality involves an exercise of judgment with regard to all of the integers of the claim. There will often be a number of reasonable alternatives. Each of the characterisations of the primary judge, and of Middleton and Perram JJ and Nicholas J in the Full Court, was reasonable. All included the elements involved in both the game controller and the player interface, and Middleton and Perram JJ rightly included the feature game in the characterisation. However, given the emphasis upon both the feature game and the configurable symbols in the specification, the best characterisation of Claim 1 is: an EGM incorporating an interdependent player interface and a game controller which includes feature games and configurable symbols.

The only objection to Claim 1 was that it was a mere scheme or intellectual idea and therefore not a manner of manufacture within s 18(1A)(a). At no stage in this litigation before the primary judge, the Full Court, or this Court did the Commissioner argue that Claim 1 failed to meet the threshold requirement for sufficient novelty or inventiveness for an alleged invention. Although the Delegate received submissions under s 28(1) of the Patents Act, which allows a person to object to the validity of a patent under s 18(1A) for the reason that the claimed invention lacks inventive step or novelty, the Delegate declined to consider those submissions. No issue was subsequently raised in the courts below concerning any threshold requirement for an alleged invention or any requirement in s 18(1A)(b), s 18(1A)(c), or s 18(1A)(d)[224].
The proper approach to assessing whether a manner of manufacture exists is that which was enunciated by this Court, as described above, in National Research Development Corporation[225]. There is only one question: is there a manner of manufacture within s 6 of the Statute of Monopolies? The focus of that question commonly leads to enquiries such as: whether the process or product is part of the useful arts rather than the fine or intellectual arts; whether there is an artificially created state of affairs with a useful result including a result of economic significance; and whether the subject matter of a claim is no more than a mere intellectual idea, scheme, or game. But, as the authorities have long shown, the limits involved in each of these enquiries are not narrow. To take an approach to a manner of manufacture that is too confined is "unsound to the point of folly"[226].
The question of whether a claim, as properly characterised, is the proper subject matter of a patent should not be deconstructed to require, separately from the general principles of patentability, consideration of whether the subject matter is "computer‑implemented". It is unnecessary to descend into the serious policy concerns that were raised against such an approach in the written and oral submissions by the Institute of Patent and Trade Mark Attorneys of Australia appearing as amicus curiae. Nor is it necessary to determine whether such consideration would amount, in substance, to a judicial addition to the exceptions in s 18(3).
It suffices to say that, although modern computers could not have been in the mind of anyone in the Jacobean era of the Statute of Monopolies, the implementation of a scheme or idea on a computer to create an artificial digital state of affairs should not be treated any differently from the implementation of a scheme or idea by any other machine to create an artificial physical state of affairs. In both cases, however, the implementation must do more than merely manipulate an abstract idea. In the language of National Research Development Corporation, it must create an artificial state of affairs and a useful result.
Claim 1, characterised in light of the specification as a whole, is a manner of manufacture within s 6 of the Statute of Monopolies. As explained above, the proper characterisation of Claim 1, as an EGM incorporating an interdependent player interface and a game controller which includes feature games and configurable symbols, is not merely the idea of a game, incorporated into a game controller, without any novelty or inventiveness. The game controller, which includes feature games and configurable symbols, has been assumed at all stages of this litigation to meet the threshold requirements for an alleged invention. No suggestion to the contrary was made in this Court. Nor, on its proper characterisation, is Claim 1 a scheme or idea for a game that is separate from the external or artificial application of that game. In the characterisation of Claim 1, the operation of the game controller cannot be severed from the interdependent player interface in the EGM. The claimed operation of the game controller, displayed through the player interface, is an altered EGM involving an artificial state of affairs and a useful result amounting to a manner of manufacture.

Aristocrat Technologies Australia Pty Ltd v Commissioner of Patents

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