Title 35 › PART III — PATENTS AND PROTECTION OF PATENT RIGHTS › CHAPTER 25 — AMENDMENT AND CORRECTION OF PATENTS › § 252
When a patent is reissued, the original patent is given up as soon as the new patent is issued. The reissued patent works the same in future legal cases as if it had been granted in the changed form from the start. If the claims are essentially the same as the original, giving up the old patent does not affect lawsuits already started. For those same claims, the reissued patent counts as continuing from the original patent date. People (and their business successors) who, before the reissue was granted, made, bought, offered for sale, used, or imported into the United States a specific thing covered by the patent may keep making, using, or selling that exact thing unless it violates a valid claim that was already in the original patent. A court handling the dispute can allow continued manufacture, sale, or use, or the use of a process, and can set fair terms to protect investments or business steps taken before the reissue.
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Patents, Source: USLM XML via OLRC
Legislative History
Reference
Citation
35 U.S.C. § 252
Title 35, Patents
Last Updated
Aug 21, 2026
Release point: 119-102