Mond Staffordshire Refinery Co Ltd v Harlem

The Mond Staffordshire Refining Co Ltd, a British company, appealed to the High Court of Australia from a decision of the Supreme Court of Victoria. The plaintiff company was the registered proprietor of the trade mark "Monsol" for chemical substances used in medicine and pharmacy, and had marketed various medical preparations under this name. The defendants, Ellis Harlem and Isaac Cyril Harlem, trading as "Mulsol" Laboratories, had begun marketing a medical preparation under the name "Mulsol" in Melbourne. The plaintiff alleged that the defendants' use of "Mulsol" infringed its trade mark and constituted passing off their goods as those of the plaintiff.

The central legal issues before the High Court were whether the defendants' use of the word "Mulsol" infringed the plaintiff's registered trade mark "Monsol" and whether it amounted to passing off. Specifically, the court had to determine if the two words were so similar as to be likely to deceive an ordinary purchaser into believing that the defendants' goods were those of the plaintiff.

A majority of the High Court, comprising Knox C.J., Gavan Duffy and Starke JJ., affirmed the decision of the Supreme Court. They reasoned that while both parties' goods belonged to the same general category, they would likely appeal to different classes of customers. The majority considered that the words "Monsol" and "Mulsol" were not sufficiently alike in appearance or sound, particularly when taking into account the common use of suffixes like "sol" or "ol" in medicinal preparations and the existence of other registered trade marks commencing with "mul". They concluded that an ordinary purchaser would not be likely to confuse goods marked "Mulsol" with those marked "Monsol". Isaacs and Rich JJ. dissented, finding a strong probability of deception due to the phonetic similarity of the words, especially considering potential mispronunciation or imprecise hearing, and the serious nature of the medicinal products involved.

The appeal was dismissed with costs.