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Functional Claim (patent)

Smith Hopen Intellectual Property Term Glossary Definition for Functional Claim (patent)
A claim term is functional when it recites a feature by what it does rather than by what it is.  Functional claiming are often viewed with care by patent examiners who are cautioned when claims merely recite a description of a problem to be solved or a function or result achieved by the invention, the boundaries of the claim scope may be unclear.

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