37 C.F.R. § 42.8 : Patents, Trademarks, and Copyrights — UNITED STATES PATENT AND TRADEMARK OFFICE, DEPARTMENT OF COMMERCE — GENERAL PATENTS — TRIAL PRACTICE BEFORE THE PATENT TRIAL AND APPEAL BOARD — TRIAL PRACTICE AND PROCEDURE —GENERAL — 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.

37 C.F.R. §42.8