605.04 Power of Attorney Filed After Registration
For purposes of recognition as a representative, the USPTO considers recognition as to a pending application to end with registration, when the application is abandoned, or when ownership changes. 37 C.F.R. §2.17(g)(1). If recognition is established in connection with an affidavit under §8, §12(c), §15, or §71, a §9 renewal application, or a §7 request, the recognition is deemed to end upon acceptance or final rejection of the filing. 37 C.F.R. §2.17(g)(2). TMEP §604.03.
See also TMEP §1612 regarding powers of attorney filed after registration, and §609.02(e) regarding changing the correspondence address after registration.