37 C.F.R. § 1.2 Business to be transacted in writing.
Title 37 - Patents, Trademarks, and Copyrights
All business with the Patent and Trademark Office should be transacted in writing. The personal attendance of applicants or their attorneys or agents at the Patent and Trademark Office is unnecessary. The action of the Patent and Trademark Office will be based exclusively on the written record in the Office. No attention will be paid to any alleged oral promise, stipulation, or understanding in relation to which there is disagreement or doubt.
Title 37: Patents, Trademarks, and Copyrights
PART 1—RULES OF PRACTICE IN PATENT CASES
Subpart A—General Provisions
General Information and Correspondence
§ 1.2 Business to be transacted in writing.
