For most of Canada's patent history, the twenty-year term ran from filing regardless of how long examination took, and an applicant absorbed the cost of any delay at the Patent Office. That changed on January 1, 2025, when amendments to the Patent Rules brought in a general system of patent term adjustment, a direct result of Canada's obligations under the Canada-United States-Mexico Agreement. The system compensates a patent owner with additional term where the Canadian Intellectual Property Office took unreasonably long to grant the patent. It is a welcome change, and also one with a short, unforgiving window to claim it.
What Patent Term Adjustment Actually Compensates
Additional term is available where a patent issues after the later of two dates: the fifth anniversary of the application's filing date, or, for a national phase entry, the date the application entered the Canadian national phase, and the third anniversary of the date examination was requested. In plain terms, if the Patent Office took longer than five years from filing, or longer than three years from the request for examination, whichever comes later, to grant the patent, the applicant may be owed extra time added to the far end of the twenty-year term. The rules subtract 38 separate categories of delay attributable to the applicant, such as time spent responding to an office action beyond the allotted period, so the adjustment reflects Patent Office delay specifically, not delay generally.
Eligibility Runs From December 2020 Forward
The adjustment applies only to patents with a filing date on or after December 1, 2020, and although the amended Patent Rules came into force January 1, 2025, no patent became eligible for additional term until December 2, 2025, the earliest date a patent could actually satisfy the five-year and three-year thresholds. For a foreign associate or an applicant managing a Canadian patent family, the practical point is that this is no longer a future consideration; patents are now issuing into a landscape where additional term is a live, calculable entitlement rather than a policy the Patent Office has merely announced.
The Three-Month Application Window
Patent term adjustment is not granted automatically. A patent owner must apply within three months of the date the patent issues, and the application must set out the calculation supporting the requested additional term. Missing that window forfeits the adjustment entirely, with no extension available. Given that the calculation itself requires working through the 38 categories of excludable delay against the full prosecution history, an applicant who waits until close to the deadline to start the analysis may not have enough runway left to finish it properly.
A Trap for Applications on Special Order
The amendments also carry a less publicized change that catches applicants off guard. Where an application has been placed under special order for expedited examination and the applicant later files a request for continued examination, the application, on or after January 1, 2025, returns to the routine examination queue, losing its special order status. An applicant who values the expedited timeline more than a further round of amendment should weigh that trade-off carefully before requesting continued examination on a special order file. Separately, CIPO has also expanded the grounds for suspending examination to include the late fee period following a missed maintenance fee payment, adding another date that now needs active monitoring rather than passive assumption.
What This Means for a Patent Portfolio
None of this changes what makes an invention patentable, but it does change what a well-run Canadian patent docket needs to track. Recently issued patents, and any still working through examination, are candidates for a term adjustment review, and the three-month application deadline means that review is best done as new patents issue, not months later once the window has closed. We regularly take on Canadian patent term adjustment reviews on a single-file basis for foreign associates and applicants alike, calculating the eligible term and preparing the application within the window the Patent Rules allow.