Burley J opened the judgment by describing the case as a dispute about trade marks, misleading or deceptive conduct and hamburgers. That is a fair summary of what made the case commercially important. Two major quick service restaurant competitors were fighting over product naming, trade mark registrations and a comparative advertising campaign, all at the same time.
McDonald’s relied on its registered trade marks for BIG MAC and MEGA MAC. The judgment records that BIG MAC had been sold in Australia since McDonald’s operations commenced here, and that McD Asia Pacific was the registered owner of the BIG MAC and MEGA MAC word marks. Hungry Jack’s, which had also operated in Australia since 1971, launched burgers called BIG JACK and MEGA JACK in early 2020.
McDonald’s said those names infringed its registered marks. It also sought removal of Hungry Jack’s BIG JACK registration from the Trade Marks Register. Hungry Jack’s denied infringement, defended its registration and cross-claimed to remove McDonald’s MEGA MAC registration for non-use in part. On top of that, McDonald’s alleged that Hungry Jack’s had misled consumers by claiming the BIG JACK had "25% more Aussie beef" than the BIG MAC.
That combination makes the case especially useful for business owners. It was not just a fight about whether two names sounded alike. It was also about how registrations can be used defensively, how non-use can narrow a registration, and how comparative advertising can fail even where the naming strategy survives.