37 CFR 1.323 : Patents, Trademarks, And Copyrights (§ 1.1 To Chapter V) — (§ 1.1 To Chapter V) — United States Patent And Trademark Office, Department Of Commerce (§ 1.1 To Parts 151-199) — General (§ 1.1 To §§ 5.31-5.33) — Rules Of Practice In Patent Cases (§ 1.1 To § 1.1071) — National Processing Provisions (§ 1.31 To § 1.378) — Correction Of Errors In Patent (§ 1.322 To § 1.325) — Certificate of correction of applicant's mistake.

The Office may issue a certificate of correction under the conditions specified in 35 U.S.C. 255 at the request of the patentee or the patentee's assignee, upon payment of the fee set forth in § 1.20(a). If the request relates to a patent involved in an interference or trial before the Patent Trial and Appeal Board, the request must comply with the requirements of this section and be accompanied by a motion under § 41.121(a)(2), § 41.121(a)(3) or § 42.20 of this title.