PatentClock

How it works

1. Enter the filing date. Use the date on the USPTO filing receipt for the provisional application.
2. Read the five dates. Each row shows the date that matters, the raw date when a rule moves it, the days remaining and the citation.
3. Download the calendar file. Save the .ics file and import it into Google Calendar, Outlook or Apple Calendar.

• Five dates from one filing date, each traced to a statute, regulation or treaty rule.
• A weekend or DC federal holiday moves only the deadlines those rules actually extend.
• The raw date stays visible next to any adjusted date.
• The calendar file carries the same dates the page shows.

Covers a US provisional utility application filed on or after 8 June 1995. Design patents, plant patents and priority dates from outside the United States are not covered.

One-off USPTO closures are not included. When an unscheduled closure applies, the real deadline is later than the date shown here, never earlier.

Common questions

What counts as the filing date?

Use the filing date the USPTO accorded to your provisional application, the date printed on the filing receipt. Do not use the day you started the draft, the day you paid, or a date after today.

What if the deadline lands on a weekend or a federal holiday?

The US non-provisional date, and the PCT date when you file at the US receiving office, move to the next business day when the 12-month date falls on a Saturday, Sunday, or federal holiday in the District of Columbia. Direct foreign filings stay on the raw date, because each national office has its own closed days and this tool does not model them. The restoration date and the national-phase date are shown raw as well.

Are design patents covered?

No. Design patents and plant patents use different periods. This calculator covers a US provisional utility application only.

What if I already missed the 12-month date?

A restoration-of-priority petition may be available until 14 months from the provisional filing date. It is a fallback, not a deadline to plan around. It needs a petition, a fee, and a statement that the delay was unintentional, and not every foreign office accepts restored priority.

Will the calendar reminders go off?

The file includes alarms 90, 30, and 7 days before each deadline, and 30 and 7 days before the restoration date. Apple Calendar and Outlook usually keep imported alarms. Google Calendar often drops alarms imported from a file and uses that calendar's own notification settings instead. If you use Google Calendar, add a reminder after you import the file.

What does this page leave out?

The national-phase date is 30 months from the priority date and applies only if a PCT application is filed. Some offices allow 31 months, and a few differ. One-off USPTO closures are not included. When an unscheduled closure applies, the real deadline is later than the date shown here, never earlier. Covers a US provisional utility application filed on or after 8 June 1995. Design patents, plant patents and priority dates from outside the United States are not covered. Not legal advice. Confirm every date with a registered patent practitioner.

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