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by redcap 3674 days ago
It's from the priority date, which was Aug 29, 1986 making this expired.

https://en.wikipedia.org/wiki/Term_of_patent_in_the_United_S...
1 comments
tzs 3674 days ago
From 35 USC 154(a):

    (2)Term.—

    Subject to the payment of fees under this title,
    such grant shall be for a term beginning on the date
    on which the patent issues and ending 20 years from
    the date on which the application for the patent was
    filed in the United States or, if the application
    contains a specific reference to an earlier filed
    application or applications under section 120, 121,
    365(c), or 386(c), from the date on which the
    earliest such application was filed.

    (3)Priority.—

    Priority under section 119, 365(a), 365(b), 386(a),
    or 386(b) shall not be taken into account in
    determining the term of a patent.
For this patent, there is a chain of specific references to earlier filed applications, but I'm not sure which of those, if any, are under section 120, 121, 365(c) or 386(c) and so affect the expiration date of the patent.
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