Home » Intellectual Property » Patent Law » What is Patent Infringement?

Patent infringement is when a person or an entity makes, uses, offers to sell, or sells a patented in the United States without the authority of the patent owner. Patent infringement can happen in one of four ways – literal infringement, infringement under something called the doctrine of equivalents, inducement of infringement, and contributory infringement.

If the patent holder’s suit is successful, the court will either force the infringer to stop using the patent, or work out an agreement whereby the infringer pays royalties to the patent holder. However, patent suits are often tricky, because the alleged infringer might succeed in proving the PTO mistakenly granted the patent in the first place.


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