603.04 Processing Correspondence Signed by Someone Other Than the Applicant or the Applicant's Designated Attorney
During the prosecution of a trademark application, every action that is not signed by the applicant must be signed by a practitioner qualified under 37 C.F.R. 10.14 to practice before the USPTO in trademark cases. 37 C.F.R. 10.18(a). Any action that is so signed will be accepted regardless of whether the practitioner who has signed is the same person who signed previously submitted papers, and regardless of whether the practitioner has filed a power of attorney. 37 C.F.R. 2.17(c). However, if the signer is different, the USPTO will continue to send correspondence to the correspondence address already established unless and until there is a written request to change that address, signed by the applicant.
Example: If an application as originally filed is accompanied by a transmittal letter bearing the name and address of an attorney, the attorney's name and address will be entered into the records of the USPTO as the correspondence address (see TMEP §603.01). If a response to an Office action signed by a different attorney is subsequently filed, the USPTO will accept and act on the response, but will continue to send correspondence to the mailing address originally established until there is a written request to change that address.
See TMEP §§603.02 et seq. regarding requests to change the correspondence address.The examining attorney should ensure that the person who signs each document, if not the applicant, is either an attorney authorized to practice before the USPTO (which normally can be presumed from the attorney's own statement or identification) or other authorized party. See TMEP §602 regarding persons who may practice before the USPTO in trademark matters, TMEP §602.03 regarding papers filed by unauthorized persons, and TMEP §§712.01 et seq. regarding the proper person to sign a response to an Office action.