37 C.F.R. § 350.2 Representation.
Title 37 - Patents, Trademarks, and Copyrights
Parties in proceedings before the Board may represent themselves or be represented by an attorney. The appearance of an attorney on behalf of any party constitutes a representation that the attorney is a member of the bar, in one or more states, in good standing.
Title 37: Patents, Trademarks, and Copyrights
PART 350—GENERAL ADMINISTRATIVE PROVISIONS
§ 350.2 Representation.