(a) A cancellation proceeding is commenced by filing in the Office a timely petition for cancellation with the required fee. (b) Any person who believes that he, she, or it is or will be damaged by a registration may file a petition, addressed to the Trademark Trial and Appeal Board, for cancellation of the registration in whole or in part. The petition for cancellation need not be verified, but must be signed by the petitioner or the petitioner's attorney, as specified in § 11.1 of this chapter