37 C.F.R. § 90.2
(a) For an appeal under 35 U.S.C. 141.
(2) In all appeals, the party initiating the appeal must comply with the requirements of the Federal Rules of Appellate Procedure and Rules for the United States Court of Appeals for the Federal Circuit, including:
(3) Additional requirements.
(b) For a notice of election under 35 U.S.C. 141(d) to proceed under 35 U.S.C. 146.