37 C.F.R. § 1.913 Persons eligible to file request for inter partes reexamination.
Title 37 - Patents, Trademarks, and Copyrights
Except as provided for in §1.907, any person other than the patent owner or its privies may, at any time during the period of enforceability of a patent which issued from an original application filed in the United States on or after November 29, 1999, file a request for inter partes reexamination by the Office of any claim of the patent on the basis of prior art patents or printed publications cited under §1.501. [68 FR 71007, Dec. 22, 2003]
Title 37: Patents, Trademarks, and Copyrights
PART 1—RULES OF PRACTICE IN PATENT CASES
Subpart H—
Requirements for Inter Partes Reexamination Proceedings
§ 1.913 Persons eligible to file request for

