Canadian · Calculator
Patent expiry calculator Canada.
Enter the filing date of a Canadian patent application and get the date its 20-year term ends. The calculation runs in your browser; nothing you enter is stored or sent.
Inputs
Result
Enter a filing date and press Calculate.
How the Canadian patent term works
Under section 44 of the Patent Act, where an application for a patent is filed on or after October 1, 1989, the term of the patent is 20 years from the filing date. This calculator adds 20 years to the date you enter and shows the result.
Maintenance fees must be paid. Section 46 requires the prescribed fees to be paid on or before the prescribed dates. If they are not, and the grace period passes, the term is deemed to have expired on the applicable prescribed date, which is earlier than the 20-year date shown here. Treat the result as the latest possible expiry, not a guarantee the patent is in force.
Filings before October 1, 1989 are not calculated. The text of section 44 used here covers filings on or after that date only, so this tool declines earlier dates rather than guess.
If you file on February 29 and the 20th anniversary has no February 29 (for example 2080 to 2100), the result shows February 28 and says so; confirm the exact date with the Canadian Intellectual Property Office.
Sources
- Patent Act, s.44: term of 20 years from the filing date for applications filed on or after October 1, 1989.
- Patent Act, s.46: maintenance fees and lapse of the term.
What a result does and doesn’t tell you
This is a date calculation, not legal advice and not a status check. It does not confirm that a patent was granted, that its maintenance fees are paid, or that it is still in force; check the Canadian Patents Database or ask a registered patent agent. Everything runs in your browser and nothing is stored or sent.