37 C.F.R. § 10.56 Canon 4.
Title 37 - Patents, Trademarks, and Copyrights
A practitioner should preserve the confidences and secrets of a client.
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
§ 10.56 Canon 4.