Commissioner of Patents v Ethyl Corporation

The Commissioner of Patents appealed to the High Court of Australia from a decision of the Supreme Court of Victoria, which had overturned the Commissioner's refusal to grant a patent to the Ethyl Corporation. The dispute concerned an application for a patent for an invention relating to a method of producing tetraethyl lead, a gasoline additive. The Commissioner had refused the patent on the grounds that the invention was not novel and was obvious.

The High Court was required to determine whether the invention, as claimed in the patent application, was new and whether it involved an inventive step, having regard to the state of the art at the time of the application. Specifically, the court had to consider whether the prior art disclosed a method that was substantially identical to the claimed invention or whether the claimed invention would have been obvious to a person skilled in the relevant art.

The court applied the principles of patent law concerning novelty and inventive step. It examined the prior art documents and the claims of the patent application to ascertain if the invention was new. The court found that the prior art did not disclose the specific process claimed by Ethyl Corporation, and therefore the invention was novel. Furthermore, the court considered whether the inventive step was present, assessing whether the invention represented a sufficient advance on existing knowledge to be considered inventive. The court concluded that the invention involved an inventive step, as it was not obvious to a person skilled in the art at the time of the application.

Consequently, the High Court allowed the appeal, setting aside the order of the Supreme Court of Victoria and restoring the Commissioner's decision to refuse the grant of the patent.