"Purposive construction" is a legal concept for interpreting patent claims. Courts frequently use this method to determine the true scope, intent and contribution of a software patent instead of literal interpretation of claims therein. It involves the analysis of the underlying technical problem that the invention claims to solve, rather than the business method ‘as such’.
Purposive construction (or purposive interpretation) is a key principle of statutory and patent claim interpretation. The Amazon.com Inc. v. Canada (Attorney General) (2011)[1] is a seminal judgment of the Federal Court of Appeal (FCA) that sheds light on this approach. It clarified the patentability of software-implemented and business-method inventions.
The case involved Amazon’s application for a ‘Method and System for Placing a Purchase Order via a Communications Network’. This was based on the “1-Click” online purchasing method, which enabled returning shoppers to place orders with a single action, that is, ‘click’ by using pre-stored customer information. Customers were identified using cookies stored locally on their computers; the identifiers were used to obtain the customer’s pre-recorded information from Amazon’s database.
The patent examiner rejected the application, stating that all claims were either obvious or directed towards non-statutory subject matter. The patent appeal board overturned the examiner’s findings on obviousness; yet, the board denied the application on the grounds of subject matter eligibility.
The Commissioner of Patents accepted the findings of the board. Thus, the claims were rejected on the grounds that business methods and software innovations were not patentable “arts” under Section 2 of the Patent Act, and that the claimed invention lacked a “physical” component.
Amazon appealed the decision.
The court held that the patent office had characterized the invention as merely a business idea executed on a generic computer, relying on a broad policy view that business methods are non-patentable. The FCA ruled that this reasoning was inconsistent with binding precedents of the Supreme Court of Canada (SCC).
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The Federal Court of Appeal determined that the claims must be purposively construed, before one examines the issue of subject matter eligibility. The claim constructions principles set out by the SCC in Free World Trust v Électro Santé Inc. (2000)[2] and Whirlpool Corp. v Camco Inc. (2000)[3], both released concurrently, were to guide the interpretation.
The Court emphasized that there is no statutory exclusion of business methods or software in the Patent Act, and that the Commissioner cannot read such exclusions into the legislation. The core issue, the FCA observed, is whether the claimed invention qualifies as an “art” or“ process” that has a physical, practical, or commercially useful application.
The FCA also criticized the Commissioner’s reliance on the Schlumberger Canada Ltd. v. Canada (Commissioner of Patents) (1982)[4] judgment, which laid down crucial principles regarding the patentability of software and business methods in Canada. It held that Schlumberger bars only the patenting of mathematical or mental algorithms, and that computer implementation by itself does not foreclose patentability.
The court enunciated the correct framework for assessing the patentability of computer-implemented and business-method inventions. It identified essential & non-essential elements based on the language of claims and the perspective of the skilled person, not on administrative policy goals. If purposive construction showed that those elements were essential, then, the court held that the invention could not be dismissed as a mere abstract idea or non-statutory business method.
While rejecting every categorical objection raised by the Patent Office, the FCA remitted the application for re-examination using the correct legal test. The patent office was directed to examine the actual claimed elements, including, the computer components, data structures, and the specific configuration that enabled one-action shopping.
The FCA emphasized that purposive construction should be done to properly ascertain if a novel business method is an essential, patentable element within a broader, technical software process. Instead of relying strictly on lexical definitions and literal meanings of words used in patent claims, this method examines the technical problem solved and the inventor's technical contribution to the field.
A software invention that produces such a ‘technical effect’ is patentable, in contrast to the mere automation of anon-patentable business scheme. The approach helps prevent the making of minor, insubstantial changes to a competitor’s patent for avoiding infringement; it also stops the excessive broadening of an invention’s scope with clever drafting.
Thus, context becomes vital when claims are read in light of the entire patent specification, comprising of description and drawings, rather than in isolation, for discerning the intended function. In essence, "purposive construction" helps the legal system distinguish between a non-patentable business idea and a genuinely inventive, patentable software implementation of that idea.
The decision fundamentally shifted Canadian patent practice. It confirmed that business methods and software are not per se excluded. The Court clarified that an invention is patent-eligible if it offers a practical application with commercially useful results.
Thus, the application of purposive-claim interpretation enjoined for checking patentability opened the door to broader protection for computer-implemented inventions, which was later reinforced by other judgments
At BLAZE VENTURES, we have elaborate processes and qualified professionals for ensuring the patentability of software-based, computer-implemented and business-method inventions and innovations.
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[1] 2011 FCA 328
[2] 2000 SCC 66
[3] 2000 SCC 67
[4] 56 CPR (2d) 204 (Fed CA)
