Designation. The designation of a domestic representative must be signed in accordance with the following guidelines:

1. If the applicant or registrant is represented by a qualified U.S. attorney, the attorney must sign; or
2. If the applicant or registrant is not represented by a qualified U.S. attorney, the individual applicant or registrant or someone with legal authority to bind a juristic applicant or registrant must sign. In the case of joint applicants or registrants who are not represented by a qualified U.S. attorney, all must sign.

37 C.F.R. §§2.11(a), 2.24(b), 2.193(e)(8).

Revocation. A revocation of domestic representative must be signed following the same guidelines for when a designation of a domestic representative is filed. 37 C.F.R. §§2.11, 2.24(b), 2.193(e)(8).

Withdrawal. A withdrawal of domestic representative must be signed by an individual domestic representative or by someone legally authorized to bind a juristic domestic representative.

See TMEP §610 regarding the designation of a domestic representative by parties not domiciled in the United States.

See TMEP §§611.06-611.06(h) for guidelines on persons with legal authority to bind various types of juristic entities and §§602-602.03(e) regarding persons who are qualified to represent others before the USPTO in trademark cases.