Joos v Commissioner of Patents

The applicant, Joos, sought to appeal a decision of the Commissioner of Patents to the High Court of Australia. The dispute concerned the patentability of an invention relating to a method of producing a particular type of plastic film. The Commissioner had refused to grant a patent on the grounds that the invention was not a manner of manufacture within the meaning of section 6 of the Statute of Monopolies, as interpreted by Australian patent law.

The central legal issue before the High Court was whether the claimed invention, a method for producing a plastic film, constituted a "manner of manufacture" for the purposes of patentability. This required the Court to consider the scope of patentable subject matter in Australia, particularly in relation to processes and the distinction between a mere discovery or abstract idea and a practical application that produces a vendible product or a useful result.

Barwick C.J. applied the established principles for determining whether an invention is a manner of manufacture, drawing on precedent from both Australian and English case law. His Honour emphasised that a patentable invention must involve an "art, process, or method" that results in a tangible product or a useful effect. The Court found that the applicant's method, which involved specific steps to alter the physical properties of a plastic film, did not merely describe a scientific principle or an abstract concept. Instead, it was a practical process that produced a film with altered characteristics, thereby falling within the definition of a manner of manufacture. The appeal was allowed.