Patent infringement occurs if another invention does substantially the same thing, in the same way with the same result as a patented invention.

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Quizplus · Accepted Answer

This is known as the "doctrine of equivalents," which allows for a finding of patent infringement even if the infringing device or process does not fall within the literal scope of the patent claims, as long as it performs substantially the same function in substantially the same way to achieve the same result.

Patent Infringement Occurs If Another Invention Does Substantially the Same