Alphapharm Pty Ltd & Ors v H Lundbeck A/S

Alphapharm Pty Ltd and others (the applicants) sought to restrain H Lundbeck A/S (the respondent) from commencing or continuing proceedings in the United States for the infringement of a patent. The applicants argued that such proceedings would be vexatious and an abuse of process, and that the respondent should be restrained from pursuing them. The matter came before the High Court of Australia.

The central legal issue before the High Court was whether the Australian court possessed the power to grant an anti-suit injunction to restrain foreign proceedings that were alleged to be vexatious and an abuse of process, particularly when those proceedings involved the enforcement of an Australian patent in a foreign jurisdiction. The court also considered the principles governing the exercise of such a power, including the balance of convenience and the potential for prejudice to the parties.

The High Court held that Australian courts do have the power to grant anti-suit injunctions in appropriate circumstances, including where foreign proceedings are vexatious or an abuse of process. However, the court emphasised that this power should be exercised with caution and only where justice requires it. In this instance, the court found that the respondent's proposed proceedings in the United States were not vexatious or an abuse of process, and that there was no sufficient basis to restrain them. The court reasoned that the enforcement of an Australian patent in a foreign jurisdiction, even if it involved allegations of infringement of that patent, did not inherently constitute an abuse of process. The applicants had not demonstrated that the US proceedings were brought for an improper purpose or that they would cause irreparable harm that could not be adequately addressed in the foreign court.

The High Court therefore dismissed the applicants' application for an anti-suit injunction.