Request for ex parte reexamination.

1. (a) Any person may, at any time during the period of enforceability of a patent, file a request for an ex parte reexamination by the Office of any claim of the patent on the basis of prior art patents or printed publications cited under § 1.501. The request must be accompanied by the fee for requesting reexamination set in § 1.20(c)(1). Please see 37 CFR 1.510 [PDF viewer required]. or MPEP 2210-2224 for more information.

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. Please see 37 CFR 1.913, 1.915 [PDF viewer required]. or MPEP 2610-2624 for more information.