37 C.F.R. § 10.101 Action as a public official.
Title 37 - Patents, Trademarks, and Copyrights
(a) A practitioner who holds public office shall not: (1) Use the practitioner's public position to obtain, or attempt to obtain, a special advantage in legislative matters for the practitioner or for a client under circumstances where the practitioner knows or it is obvious that such action is not in the public interest. (2) Use the practitioner's public position to influence, or attempt to influence, a tribunal to act in favor of the practitioner or of a client. (3) Accept any thing of value from any person when the practitioner knows or it is obvious that the offer is for the purpose of influencing the practitioner's action as a public official. (b) A practitioner who is an officer or employee of the United States shall not practice before the Office in patent cases except as provided in §10.10(c) and (d). [50 FR 5172, Feb. 6, 1985, as amended at 54 FR 6520, Feb. 13, 1989]
Title 37: Patents, Trademarks, and Copyrights
PART 10—REPRESENTATION OF OTHERS BEFORE THE PATENT AND TRADEMARK OFFICE
Patent and Trademark Office Code of Professional Responsibility
§ 10.101 Action as a public official.

