I am so confused in a question and need your kind help.

If I filed a PCT case on 2018/1/1 claiming priority to an US non-provisional (US1), which was filed on 2017/1/1. Then, if the US national phase of the PCT (WO-US) enters and grants, when will it expire? 2038/1/1? If so, don't I get additional 1 year besides the normail 20 years ?

  • I am guessing a request for terminal disclaimer could fix this issue in practice, but if there is no such request, what is going to happen?
    – Jack H.
    Aug 15, 2018 at 4:34

1 Answer 1


There is no extra year in this case. The relevant law is -

35 U.S.C. 154 Contents and term of patent; provisional rights. (a) IN GENERAL.—

(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.

There is an exception if the earliest application is a provisional. Then it could expire 21 years from the provisional fining date, assuming the non-provisional or pct was filed on the last day of the term of the provisional.

  • Interesting. I'd like to add that it's different in Europe where claiming priority does give you an extra year.
    – user18033
    Aug 15, 2018 at 17:47

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