Title 35 › Part PART III— - PATENTS AND PROTECTION OF PATENT RIGHTS › Chapter CHAPTER 32— - POST-GRANT REVIEW › § 325
A post-grant review cannot start if the person who asked for it, or the person who really benefits from it, already sued a court to challenge the patent before filing the review petition. If that person sues on or after filing the petition, the court case is automatically paused until the patent owner asks the court to lift the pause, the patent owner sues or counterclaims for infringement, or the petitioner asks the court to dismiss the case. A counterclaim that challenges validity does not count as starting a blocking civil action. If an infringement lawsuit is filed within 3 months after the patent was granted, a court cannot delay deciding a patent owner’s request for a preliminary injunction just because a post-grant review was filed or started. The Patent Office Director can combine multiple post-grant reviews of the same patent into one. While a post-grant review is happening, the Director can order how other Office proceedings about the same patent proceed, including pausing, moving, combining, or ending them, and may reject petitions that repeat the same art or arguments. If a post-grant review ends with a final written decision (section 328(a)), the petitioner or related parties cannot raise in the Office, in certain court cases (28 U.S.C. 1338), or at the International Trade Commission (section 337) any issues they raised or reasonably could have raised in that review. Also, a post-grant review cannot be started to cancel a claim in a reissue patent that is the same or narrower than the original if time limits in section 321(c) would have barred a review of the original patent.
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Patents — Source: USLM XML via OLRC
Legislative History
Reference
Citation
35 U.S.C. § 325
Title 35 — Patents
Last Updated
Apr 6, 2026
Release point: 119-73