37 CFR 1.935 : 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) — Inter Partes Reexamination Of Patents That Issued From An Original Application Filed In The United States On Or After November 29, 1999 (§ 1.902 To § 1.997) — Office Actions And Responses (Before The Examiner) In Inter Partes Reexamination (§ 1.935 To § 1.953) — Initial Office action usually accompanies order for inter partes reexamination.