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Intellectual PropertyPatent Litigation

What Constitutes Patent Infringement: Claims and Defenses: A Practical Guide

A patent infringement claim is a federal lawsuit asserting that another party is practicing a patented invention without authority. This guide explains, in plain language for accused businesses, patent owners, and the lawyers who advise them, what actually constitutes patent infringement and how infringement claims and defenses work in U.S. federal court. It begins where every infringement analysis begins—the patent's claims and the all-elements rule—and then explains the types of infringement (direct under 35 U.S.C. 271(a); induced and contributory under 271(b)-(c); divided infringement after Akamai; and the special categories in 271(e), (f), and (g)), the pivotal role of claim construction under Markman and Phillips, and literal infringement and the doctrine of equivalents under Warner-Jenkinson and Festo. It surveys the full bench of defenses—non-infringement, invalidity (Sections 102, 103, 112, and 101), inequitable conduct, license and exhaustion, and equitable estoppel—and the remedies, from a Georgia-Pacific reasonable royalty and Panduit lost profits to enhanced damages for willfulness under Halo, attorney's fees under Octane, and injunctions under eBay. A running hypothetical—an encryption-key startup that receives a cease-and-desist letter—anchors the analysis, and the guide closes with an FAQ, a reference table of leading authorities, and practical takeaways.

Casey Scott McKayMarch 27, 202461 min read