37 C.F.R. § 42.7 : 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 — Management of the record

(a) The Board may expunge any paper directed to a proceeding or filed while an application or patent is under the jurisdiction of the Board that is not authorized under this part or in a Board order or that is filed contrary to a Board order.
(b) The Board may vacate or hold in abeyance any non-Board action directed to a proceeding while an application or patent is under the jurisdiction of the Board unless the action was authorized by the Board.

37 C.F.R. §42.7