37 CFR § 41.200 - Procedure; pendency.
(b) Any reference to 35 U.S.C. 102 or 135 in this subpart refers to the statute in effect on March 15, 2013, unless otherwise expressly indicated. Any reference to 35 U.S.C. 141 or 146 in this subpart refers to the statute applicable to the involved application or patent.
(c) Patent interferences shall be administered such that pendency before the Board is normally no more than two years.