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Cancellation proceeding in trademark is a proceeding before the Trademark Trial and Appeal Board in which the plaintiff seeks to cancel an existing registration of a mark. The proceeding can only be filed after issuance of a registration. A petition for cancellation can be filed by any person who believes that s/he is or will be damaged by the registration of the mark. In the U.S., a petition to cancel a registration can only be filed after a trademark has achieved registration on either the Principal or the Supplemental Registers for up to five years after the registration date.
After five years, a petition for cancellation can be filed based on the following grounds: