Esso Research and Engineering Co v Commissioner of Patents

Esso Research and Engineering Co (the applicant) sought leave to appeal against a decision of the Commissioner of Patents (the respondent) refusing to grant a patent for an invention relating to a process for the production of lubricating oil. The applicant had lodged an application for a patent in Australia, which was examined by the respondent. The respondent refused the application on the grounds that the invention was not a manner of manufacture within the meaning of section 6 of the Statute of Monopolies, and therefore not a patentable invention.

The central legal issue before Fullagar J. was whether the applicant's invention, a process for producing lubricating oil, constituted a "manner of manufacture" for the purposes of patentability under Australian law. This required the court to consider the scope and interpretation of this fundamental requirement for patentable subject matter, particularly in the context of chemical processes.

Fullagar J. applied the established principles for determining what constitutes a "manner of manufacture," drawing on precedent that a patentable invention must involve the application of skill and ingenuity to the production of some vendible product. His Honour found that the applicant's process, which involved specific steps and conditions to produce a new and improved lubricating oil, fell within this definition. The invention was not merely an abstract scientific discovery but a practical method for creating a tangible product with commercial utility, thus satisfying the requirement of being a manner of manufacture.