Intellectual PropertyPatent
What Constitutes Patent Infringement?
Patent infringement is, at its heart, a simple question dressed in intimidating clothing: does the accused product or process include every element of at least one patent claim? This article walks judges, lawyers, and non-lawyers alike through the full anatomy of an infringement analysis under 35 U.S.C. 271—from direct, induced, contributory, and divided infringement, to the all-elements rule, claim construction, and the doctrine of equivalents (with its Warner-Jenkinson and Festo guardrails). It explains literal infringement versus equivalents, the two-step infringement framework, and what makes infringement "willful" enough to triple the damages under Halo. It surveys the often-overlooked infringement varieties under Section 271(e), (f), and (g), the major defenses (non-infringement, invalidity, inequitable conduct, exhaustion, and licenses), the remedies a patentee can win, and the special role of the International Trade Commission for imported goods. Throughout, plain-English examples turn abstract doctrine into something you can actually picture, and links to deeper resources let you go as far down the rabbit hole as you like.