Moore and Hesketh v Phillips

The High Court heard an appeal from a decision of the Commissioner of Patents concerning an application for letters patent for a method of treating ores. The applicants, Moore and Hesketh, opposed the grant of the patent to the respondent, Phillips, arguing that Phillips's claimed invention had already been described in their own prior Queensland patent and was therefore not novel and already in the possession of the public.

The legal issues before the Court were whether the respondent's claimed invention, as described in his specification, was already in the possession of the public by virtue of the appellants' prior patent, and consequently, whether a patent should be granted to the respondent. The Court was required to construe the claims of the respondent's application in light of his entire specification and compare them with the claims and description in the appellants' Queensland patent, particularly as they related to the treatment of iron oxide ores.

The Court reasoned that while the entire specification should be considered when construing a claim, a patent applicant is only entitled to protection for what is explicitly claimed. It found that the respondent's invention, specifically concerning the treatment of iron oxide ores, had been substantially described in the appellants' prior Queensland patent. Therefore, the respondent's invention was considered to be "otherwise in the possession of the public" under section 56(f) of the Patents Act 1903, precluding the grant of a patent in its current form.

The appeal was allowed, and the decision of the Commissioner of Patents was reversed. The Court declared that a patent should not be granted unless the respondent sought leave to amend his specification within four months. The time for sealing the patent was extended accordingly, and the respondent was ordered to pay the appellants' costs of the opposition and the appeal.