If a post-grant review petition is filed under section 321, the patent owner shall have the right to file a preliminary response to the petition, within a time period set by the Director, that sets forth reasons why no post-grant review should be instituted based upon the failure of the petition to meet any requirement of this chapter. (Added Pub. L. 112–29, § 6(d) , Sept. 16, 2011 , 125 Stat. 306 .) Statutory Notes and Related Subsidiaries Effective Date Section effective upon the expiration of the 1-year period beginning Sept. 16, 2011 , and applicable only to patents described in section 3(n)(1) of Pub. L. 112–29 ( 35 U.S.C. 100 note), with certain exceptions and limitations, see section 6(f)(2), (3) of Pub. L. 112–29 , set out as a note under section 321 of this title . CFR Title Parts 37 42