ICI Plc v Toyo Ink Mfg Co Ltd

ICI Plc and Toyo Ink Mfg Co Ltd were parties to a dispute before the Federal Court of Australia. The core of the disagreement concerned the interpretation and application of section 41 of the Patents Act 1990 (Cth), which deals with the entitlement to a patent. ICI sought to revoke a patent granted to Toyo Ink, alleging that the patent had been granted to the wrong party.

The primary legal issue before the Court was to determine who was the true inventor or entitled person under section 41 of the Patents Act 1990 (Cth) in circumstances where the applicant for the patent was not the inventor. This involved considering the chain of entitlement and whether the applicant had acquired the rights of the inventor through assignment or other lawful means. The Court was required to assess the evidence presented by both parties to establish the correct chain of title.

Branson J extensively analysed the structure and implications of section 41. The Court's reasoning focused on the statutory definition of "entitled person" and the requirements for establishing a valid assignment of invention rights. The principles applied centred on the strict interpretation of patent law provisions concerning inventorship and entitlement, requiring clear evidence of a transfer of rights from the original inventor to the patent applicant. The Court considered whether the applicant had demonstrated that they had lawfully acquired the rights of the inventor, thereby establishing their entitlement to the patent.