Linotype Co Ltd (In Liquidation) v Mounsey

The parties to this appeal were the Linotype Co Ltd (in liquidation), the appellants and opponents to a patent application, and William Henry Mounsey, the respondent and applicant for the patent. The dispute concerned Mounsey's application for letters patent for an "improved matrix cleaner for linotype machines." The Linotype Co opposed the grant of the patent on the grounds of want of novelty and prior publication, specifically relying on an earlier patent specification by Lock and Gardner. The matter came before the High Court of Australia on appeal from the Commissioner of Patents, who had dismissed the opposition.

The legal issues before the High Court were whether Mounsey's alleged invention was novel, and whether the objection of want of novelty encompassed a lack of sufficient inventiveness. Specifically, the court had to determine if the differences between Mounsey's proposed invention and the prior art described in Lock's patent were substantial enough to warrant a patent, or if Mounsey's invention was substantially identical to what was already known.

The majority of the High Court, comprising Griffith C.J. and O'Connor J., held that the alleged invention was not novel. They reasoned that the word "novel" in section 56(e) of the Patents Act 1903 should be interpreted in its established patent law sense, meaning that the invention must not be substantially identical to a known process or "manner of manufacture." Applying this principle, they found that Lock's patent already disclosed the concept of automatically cleaning the edges of linotype matrices with brushes. While Mounsey's application proposed cleaning both edges simultaneously and at different locations, the court considered these differences to be insufficient to distinguish the invention from the prior art. They applied the principle that a patent cannot be granted for a well-known mechanical contrivance applied in a manner or to a purpose analogous to its known use, without sufficient ingenuity to overcome fresh difficulties. Higgins J. dissented, arguing that Mounsey's invention achieved substantially additional results by substantially additional means, and that the objection of want of novelty did not permit the opponent to raise the question of insufficient inventiveness.

The High Court allowed the appeal, setting aside the decision of the Commissioner of Patents. The court ordered that the application for letters patent by William Henry Mounsey should be refused.