37 CFR § 41.10 - Correspondence addresses.

---
identifier: "/us/cfr/t37/s41.10"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "37 CFR § 41.10 - Correspondence addresses."
title_number: 37
title_name: "Patents, Trademarks, and Copyrights"
section_number: "41.10"
section_name: "Correspondence addresses."
chapter_name: "UNITED STATES PATENT AND TRADEMARK OFFICE, DEPARTMENT OF COMMERCE"
subchapter_number: "A"
subchapter_name: "GENERAL"
part_number: "41"
part_name: "PRACTICE BEFORE THE PATENT TRIAL AND APPEAL BOARD"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "35 U.S.C. 2(b)(2), 3(a)(2)(A), 21, 23, 32, 41, 134, 135, and Public Law 112-29."
regulatory_source: "69 FR 50003, Aug. 12, 2004, unless otherwise noted."
cfr_part: "41"
---


# 41.10 Correspondence addresses.

Except as the Board may otherwise direct,

(a) *Appeals.* Correspondence in an application or a patent involved in an appeal (subparts B and C of this part) during the period beginning when an appeal docketing notice is issued and ending when a decision has been rendered by the Board, as well as any request for rehearing of a decision by the Board, shall be mailed to: Patent Trial and Appeal Board, United States Patent and Trademark Office, PO Box 1450, Alexandria, Virginia 22313-1450. Notices of appeal, appeal briefs, reply briefs, requests for oral hearing, as well as all other correspondence in an application or a patent involved in an appeal to the Board for which an address is not otherwise specified, should be addressed as set out in § 1.1(a)(1)(i) of this title.

(b) *Interferences.* Mailed correspondence in interference (subpart D of this part) shall be sent to Mail Stop INTERFERENCE, Patent Trial and Appeal Board, United States Patent and Trademark Office, PO Box 1450, Alexandria, Virginia 22313-1450.

(c) *Trial Proceedings.* Correspondence in trial proceedings (part 42 of this title) are governed by § 42.6(b) of this title.

[77 FR 46630, Aug. 6, 2012]