37 CFR 1.2: Business to be transacted in writing

Taken from the Ninth Edition of the MPEP, Revision 07.2015, Last Revised in November 2015

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1.2    Business to be transacted in writing.

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.