Winnebago Industries Inc v Knott Investments Pty Ltd (No 4)

Winnebago Industries Inc sought relief against Knott Investments Pty Ltd and others for passing off and other intellectual property related claims. The Federal Court of Australia was tasked with determining the appropriate assessment of damages for the passing off and deciding on the availability of cumulative remedies and the necessity of establishing fraud for pecuniary relief. The central legal issues revolved around the correct methodology for assessing damages for passing off, the applicability of the 'user principle', and the nature and extent of relief that could be granted.

The court held that damages for passing off should be assessed by reference to a reasonable royalty or licence fee, considering the 'user principle'. This principle was applied to ensure that damages were proportionate to the use made by the defendants. The court concluded that damages against the first respondent should be assessed from 14 October 2004, while damages against the second to twelfth respondents should be assessed from 14 October 2010, the date the proceedings commenced. The court further determined that pre-judgment interest should be awarded pursuant to s 51A of the Federal Court of Australia Act 1976 (Cth). The court mandated that the parties perform the necessary calculations and bring in agreed orders by 16 December 2015, with an option for a reasonable extension if needed.

The court's decision emphasised the importance of tailored calculations for each respondent based on their specific sales data and the periods relevant to their involvement in the infringement. The court also highlighted that the applicant should be awarded pre-judgment interest, with the details of such interest to be determined by the parties. Any disagreements on the calculations or the form of the final orders were to be resolved initially by relisting the proceeding for mention.