Title 35 › Part PART III— - PATENTS AND PROTECTION OF PATENT RIGHTS › Chapter CHAPTER 32— - POST-GRANT REVIEW › § 326
The Director must write rules for how post-grant reviews work. The rules must make case files public (but let filings stay sealed while a sealing request is decided), say what grounds are enough to start a review, allow extra evidence after a petition, set how the review fits with other patent actions, limit discovery to evidence tied to the parties’ factual claims, and allow penalties for misuse that harasses or delays. The rules must protect confidential information, let the patent owner file a response with any affidavits or expert support, allow the owner to move to cancel claims or propose a reasonable number of substitute claims (and make amendment materials part of the public record), give either side a chance for an oral hearing, require a final decision within 1 year (but allow up to a 6-month extension for good cause), and give the petitioner at least 1 chance to file written comments. The Director must consider effects on the economy, the patent system’s integrity, and the Office’s ability to finish reviews on time. The Patent Trial and Appeal Board will run each post-grant review. The petitioner must prove unpatentability by a preponderance of the evidence.
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Patents — Source: USLM XML via OLRC
Legislative History
Reference
Citation
35 U.S.C. § 326
Title 35 — Patents
Last Updated
Apr 6, 2026
Release point: 119-73