35 U.S.C. § 323 - U.S. Code - Unannotated Title 35. Patents § 323. Preliminary response to petition

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.