37 CFR § 42.8 - Mandatory notices.

---
identifier: "/us/cfr/t37/s42.8"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "37 CFR § 42.8 - Mandatory notices."
title_number: 37
title_name: "Patents, Trademarks, and Copyrights"
section_number: "42.8"
section_name: "Mandatory notices."
chapter_name: "UNITED STATES PATENT AND TRADEMARK OFFICE, DEPARTMENT OF COMMERCE"
subchapter_number: "A"
subchapter_name: "GENERAL"
part_number: "42"
part_name: "TRIAL 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, 6, 21, 23, 41, 134, 135, 143, 153, 311, 312, 314, 316, 318, 321-326, 328; Pub. L. 112-29, 125 Stat. 284; and Pub. L. 112-274, 126 Stat. 2456."
regulatory_source: "77 FR 48669, Aug. 14, 2012, unless otherwise noted."
cfr_part: "42"
---


# 42.8 Mandatory notices.

(a) Each notice listed in paragraph (b) of this section must be filed with the Board:

(1) By the petitioner, as part of the petition;

(2) By the patent owner, or applicant in the case of derivation, within 21 days of service of the petition; or

(3) By either party, within 21 days of a change of the information listed in paragraph (b) of this section stated in an earlier paper.

(b) Each of the following notices must be filed:

(1) *Real party-in-interest.* Identify each real party-in-interest for the party.

(2) *Related matters.* Identify any other judicial or administrative matter that would affect, or be affected by, a decision in the proceeding.

(3) *Lead and back-up counsel.* If the party is represented by counsel, then counsel must be identified.

(4) *Service information.* Identify (if applicable):

(i) An electronic mail address;

(ii) A postal mailing address;

(iii) A hand-delivery address, if different than the postal mailing address;

(iv) A telephone number; and

(v) A facsimile number.