Title 35 › Part III— PATENTS AND PROTECTION OF PATENT RIGHTS › Chapter 29— REMEDIES FOR INFRINGEMENT OF PATENT, AND OTHER ACTIONS › § 287
Patentees and people who make, sell, or import patented items must mark those items so the public knows they are patented. Marking can show the word “patent” or “pat.” plus the patent number, or a free public web address that links the item to the patent number. If you do not mark, you cannot collect money for infringement unless you tell the infringer and they keep infringing after that notice. Filing a lawsuit counts as giving that notice. For products made by patented processes (handled under section 271(g)), the usual patent remedies apply but with special rules. Those special rules do not help anyone who practiced the process, is connected to the person who practiced it, or knew the process was used before infringing. No remedies apply to products a defendant already had or was shipping before they learned of the infringement. Courts must look at the parties’ good faith about written “requests for disclosure,” which are limited written requests sent before importing or selling that ask a manufacturer to identify process patents that might apply. Good faith is shown by making the request, giving a timely response, and passing that response to the manufacturer or supplier with a request for a written statement that the patented process was not used. A person who gets such a response must pay a reasonable fee to cover costs, but not more than a commercial automated patent search or $500. “Notice of infringement” means actual knowledge or a written notice that explains which process is claimed and why. If you get that notice, you must promptly send it to the manufacturer or supplier and get a written statement showing a factual basis that the patents are not infringed, or you will be treated as having notice. Buying an unusually large amount of a product creates a presumption you knew it was made by a patented process. When a licensed medical practitioner performs a medical or surgical procedure that would otherwise infringe, certain court remedies (like injunctions, money damages, and fee awards) do not apply to the practitioner or to related health care entities. “Medical activity,” “medical practitioner,” “related health care entity,” and other terms are defined in the law. This protection does not cover using a patented machine, drug, or composition in violation of a patent, practicing a patented use of a composition, or practicing a patented biotechnology process. It also does not apply to people or entities engaged in commercial development, manufacture, sale, import, distribution, or certain regulated pharmacy or clinical laboratory services. Finally, these medical-practice limits do not apply to patents from applications with an effective filing date before September 30, 1996.
Full Legal Text
Patents — Source: USLM XML via OLRC
Legislative History
Reference
Citation
35 U.S.C. § 287
Title 35 — Patents
Last Updated
Apr 5, 2026
Release point: 119-73not60