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  • When must a patent application be filed before the first public disclosure or offer for sale?
    • Almost everywhere in the world, except the United States, a patent application must have a priority date before the first public disclosure. Filing a patent application in any country ascribing to the Patent Cooperation Treaty gives the priority date. One invention may have multiple priority dates.

    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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