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  • How long is a patent valid?
    • Patents issuing prior to June 8, 1995 can last up to 17 years from the date of issuance. Patents resulting from applications that were pending on June 8, 1995 can last up to the longer of: 17 years from the date of issuance or 20 years from the date of filing. Patents resulting from applications filed after June 8, 1995 can last up to 20 years from the date of filing.

    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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