605.03 Associate Powers of Attorney
Once the applicant or registrant has designated a qualified practitioner, the practitioner may sign an associate power of attorney, appointing another qualified practitioner -- including one from a different law firm -- as an additional person authorized to represent the applicant or registrant. 37 C.F.R. §2.17(c)(2)). Note, however, that appointment of an associate attorney from a different law firm does not change the correspondence address from that of the practitioner designated by the applicant or registrant. 37 C.F.R. §2.18(a)(7); see TMEP §§609, 609.01-609.02(b).
If the applicant or registrant revokes the original power of attorney, the revocation also discharges any associate power signed by the practitioner whose power has been revoked. 37 C.F.R. §2.17(c)(2).
If the practitioner who signed an associate power withdraws, the withdrawal discharges any associate power signed by the withdrawing practitioner upon acceptance of the request for withdrawal by the USPTO. 37 C.F.R. §2.17(c)(2).