1.913—Persons eligible to file request for inter partes reexamination.
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.