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When does a 1986 patent issue expire?[ Follow Ups ] [ Post Followup ] [ Patent Forum ] [ FAQ ] Posted by Lion Kuntz on November 11, 2003 at 20:39:10: I recalled there was a 17 year term on patents. That changed in 1995, but did it apply retroactively to in-force patents, or only new issues thence-forward? I am specifically interested in knowing if United States Patent 4,572,812 is still covered? Is there a method to discover when a patent expires? The issue date of this patent might not represent the filing date -- which rules, the initial application filing date, or the date of USPTO approval and issuance? Thank you for your reply... Lion Kuntz
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