604.02 Attorney Bar Information Required
37 C.F.R. §2.17 Recognition for representation.
(b)(3) Bar information required. A practitioner qualified under §11.14(a) of this chapter will be required to provide the name of a State, as defined in §11.1 of this chapter, in which he or she is an active member in good standing, the date of admission to the bar of the named State, and the bar license number, if one is issued by the named State. The practitioner may be required to provide evidence that he or she is an active member in good standing of the bar of the specified State.
A qualified U.S. attorney will be required to provide his or her bar information to represent an applicant or registrant at the USPTO. 37 C.F.R. §2.17(b)(3).
See TMEP §602.01(a) for more information regarding attorney bar information in addition to other attorney identification information.