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  • What is the requirement of "useful"?
    • An invention that is useful is one that functions. This requirement is to avoid issuance of patents on perpetual motion machines. Some inventions are so advancing of science that many people do not currently have the capacity to understand how the invention functions. Scientific testing can be used to prove that this requirement has been met.

    Updated: 11/12/99
    Important: These Frequently Asked Questions (FAQs) provided by the Patent Cafe where prepared by N Paul Friederichs III and Andy Gibbs. They are used with permission of the Patent Cafe. More intellectual property resources can be found at the Patent Cafe.

    These Frequently Asked Questions are based on Federal Law.
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