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In reference to the patent: US4364234

Do I require to get license of patent even after expiry of patent?

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  • I think the edit may have changed the intention of the question - could OP clarify?
    – JDMc
    Feb 18, 2015 at 19:26

1 Answer 1

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The patent in question has expired. No fees or licenses are due for what it covered. However, it is possible that your product infringes on other, newer, in-force patents.

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