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. 35 U.S.C. § 323 Added Pub. L. 112-29, §6(d), Sept. 16, 2011, 125 Stat. 306. STATUTORY NOTES AND RELATED SUBSIDIARIES EFFECTIVE DATESection effective upon the expiration