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Interactive Tool

PCT to US National Stage
Timeline Calculator

Enter your priority date to instantly calculate every international patent phase deadline — PCT filing, WIPO publication, US national stage entry, and extended jurisdiction deadlines. Weekend rollover will be applied.

PCT · Deadline Calculator
International Phase Timeline
Date of first local filing — all PCT deadlines calculated from here
Month 0
Priority Filing
Date of first local filing. Every deadline runs from this date.
Month 12
PCT Application
Last date to file with WIPO. Missing it forfeits the priority date.
Month 18
Publication
WIPO automatically publishes the application. Priority remains active.
Month 30 — Critical
US National Stage
Last date to enter the US national phase. This deadline is permanent.
Month 31
Extended Phase
Verify countries with extensions with an attorney.
*Weekend rollover applied automatically — deadlines falling on Saturday or Sunday roll to the following Monday. Federal holidays are not calculated. Consult a registered patent attorney for binding deadline verification and docketing.