37 C.F.R. § 42.4 : 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 — Notice of trial
(a)Institution of trial. The Board institutes the trial on behalf of the Director.
(b) Notice of a trial will be sent to every party to the proceeding. The entry of the notice institutes the trial.
(c) The Board may authorize additional modes of notice, including:
(1) Sending notice to another address associated with the party, or
(2) Publishing the notice in the Official Gazette of the United States Patent and Trademark Office or the FEDERAL REGISTER.