37 CFR 2.17
Recognition for representation.

Last updated in November 2005.
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§2.17 Recognition for representation.

(a)
When an attorney as defined in § 10.1(c) of this chapter acting in a representative capacity appears in person or signs a document in practice before the United States Patent and Trademark Office in a trademark case, his or her personal appearance or signature shall constitute a representation to the United States Patent and Trademark Office that, under the provisions of § 10.14 and the law, he or she is authorized to represent the particular party in whose behalf he or she acts. Further proof of authority to act in a representative capacity may be required.
(b)
Before any non-lawyer, as specified in § 10.14(b) of this chapter, will be allowed to take action of any kind with respect to an application, registration or proceeding, a written authorization from the applicant, registrant, party to the proceeding, or other person entitled to prosecute such application or proceeding must be filed.
(c)
To be recognized as a representative, an attorney as defined in § 10.1(c) of this chapter may file a power of attorney, appear in person, or sign a document on behalf of an applicant or registrant that is filed with the Office in a trademark case.
(d)
A party may file a power of attorney that relates to more than one trademark application or registration, or to all existing and future applications and registrations of that party. A party relying on such a power of attorney must:
(1)
Include a copy of the previously filed power of attorney; or
(2)
Refer to the power of attorney, specifying the filing date of the previously filed power of attorney; the application serial number (if known), registration number, or inter partes proceeding number for which the original power of attorney was filed; and the name of the party who signed the power of attorney; or, if the application serial number is not known, submit a copy of the application or a copy of the mark, and specify the filing date.