Act § 3(n) Effective Date.-
(1) IN GENERAL.—Except as otherwise provided in this section, the amendments made by this section shall take effect upon the expiration of the 18-month period beginning on the date of the enactment of this Act [i.e., March 16, 2013], and shall apply to any application for patent, and to any patent issuing thereon, that contains or contained at any time—
(A) a claim to a claimed invention that has an effective filing date as defined in section 100(i) of title 35, United States Code, that is on or after the effective date described in this paragraph [March 16, 2013]; or
(B) a specific reference under section 120, 121, or 365(c) of title 35, United States Code, to any patent or application that contains or contained at any time such a claim.
Pub. L. No. 112-29, § 3(n), 125 Stat. 293 (Sept. 16, 2011)