How to use the PCT national phase entry deadline calculator
A PCT international application buys time, but it never becomes a patent by itself. To keep rights alive in a country you must enter its national phase with the required translation and fees. Pick the priority date and the office, and this tool shows the deadline, the days left and the days already used. The month figure stays editable because offices differ.
The clock runs from the priority date, not the international filing date. If no priority is claimed, the international filing date is the priority date. Under PCT Rule 80.2 a period expressed in months ends on the same day of the month; if that day does not exist, it ends on the last day of that month. Every figure on this page uses that one rule.
Authority: for the United States the deadline is 30 months under 35 U.S.C. 371(b) and 37 C.F.R. 1.495, which differs from the 31 months used by KIPO and the EPO. See also PCT Articles 22 and 39 and Rules 80.2 and 80.5. Figures are stated as of September 2026.
This calculator is for reference only and is not legal advice. Confirm the deadline with the receiving office and a registered patent attorney or agent before you rely on it.
Frequently asked questions
As a rule the application stops having effect in that country. Many offices allow reinstatement where the delay was unintentional or unavoidable and the request is filed within a set period, so contact your patent attorney immediately rather than assuming the case is lost.
It does not move the deadline for offices that apply the 30 month period from the priority date. The demand affects which article governs and the examination timetable, not the priority date the count starts from.