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What is an opposition window?

Senior Trademark Attorney

The opposition window (also called the opposition period) is the set timeframe following publication of a trademark application during which third parties can file a formal challenge against the mark's registration.

The length of the opposition window varies from jurisdiction to jurisdiction. For example, it’s 30 days in the US (which is extendable with a special request), 2 months in the UK, 3 months in the EU, Australia, New Zealand, China, Canada, Japan, and Brazil, and longer in some jurisdictions, such as Russia (6 months) and Vietnam (11 months). If no oppositions are filed during the publication window, the application can proceed to registration.

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