An applicant for registration of a mark, party to an interference proceeding, party to an opposition proceeding, party to an application to register as a lawful concurrent user, party to a cancellation proceeding, a registrant who has filed an affidavit as provided in section 1058 of this title or section 1141k of this title, an applicant for renewal, or a registrant subject to an ex parte expungement proceeding or an ex parte reexamination proceeding, who is dissatisfied with the decision of the Director or Trademark Trial and Appeal Board, may appeal to the United States Court of Appeals for the Federal Circuit thereby waiving his right to proceed under subsection (b) of this section: Provided, That such appeal shall be dismissed if any adverse party to the proceeding, other than the Director, shall, within twenty days after the appellant has filed notice of appeal according to paragraph (2) of this subsection, files notice with the Director that he elects to have all further proceedings conducted as provided in subsection (b) of this section. Thereupon the appellant shall have thirty days thereafter within which to file a civil action under subsection (b) of this section, in default of which the decision appealed from shall govern the further proceedings in the case.