A notice of opposition is a formal written communication filed with the Trademark Trial and Appeal Board (TTAB) by a party who believes they will be damaged by the registration of a trademark. This process serves as a legal challenge to the applicant's trademark, allowing the opposer to present their arguments and evidence against the registration. The notice initiates an adversarial proceeding where both parties can present their cases, ultimately leading to a decision by the TTAB regarding the validity of the trademark application.
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