After a trademark application has been preliminarily approved by the USPTO examining attorney, the pending application will be published for opposition – i.e., made available during a 30-day window, which can be extended, for any third party to file a challenge called a Notice of Opposition. The filing of the Notice of Opposition creates a trademark opposition proceeding before the USPTO’s Trademark Trial and Appeal Board (TTAB) with deadlines set in a scheduling order.
Here’s a helpful article on how to respond to a TTAB Notice of Opposition.
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