Under U.S. patent, the notion there need not be an exact copying of an invention to prove a case of patent infringement is known as the:

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The doctrine of equivalents is a legal principle under U.S. patent law that allows a patent holder to still pursue a claim of infringement against a defendant whose product or process does not literally infringe the patent in question, but where there is substantial similarity between the two. It applies when an accused product or process performs substantially the same function in substantially the same way to achieve substantially the same result as the patent claim in question. The other options, such as the Law of similar goods, As-good-as doctrine, and Doctrine of comparable goods, are not legal principles recognized under U.S. patent law.

Under US Patent, the Notion There Need Not Be an Exact