If you miss an annual maintenance fee with the Canadian Intellectual Property Office (CIPO), your patent will lapse into abandonment. To reinstate it, you must pay all outstanding fees, a late fee, and successfully prove to CIPO that you exercised “due care” to avoid the missed deadline.
Securing a patent in Canada is an expensive and time-consuming accomplishment. However, simply obtaining the patent does not mean your intellectual property is protected forever without further action. Under Canadian law, patent holders must pay an annual maintenance fee to CIPO to keep their rights active. 📅 Missing this crucial deadline can have disastrous consequences for your business.
If a deadline slips through the cracks, your patent becomes abandoned, opening the door for competitors to legally use your invention. Fortunately, the Patent Act provides a specific legal mechanism for reinstating a lapsed patent. Navigating this process, particularly the strict “due care” requirement, demands swift action and usually the help of a licensed patent agent.
Step-by-Step Process for Reinstatement in Canada
The rules for reviving a patent apply uniformly across Canada, whether your tech startup is based in Toronto, Montreal, or Vancouver. Here is how the federal reinstatement process generally unfolds.
Step 1: Identify the Late Fee Window
If you miss your initial annual deadline, CIPO will send a formal notice. 📬 You generally have a grace period of six months from the original due date to pay the regular maintenance fee plus a standard late fee. If you make the payment within this window, the patent remains active, and you do not need to prove “due care”.
Step 2: Entering the Reinstatement Period
If you miss the six-month late fee window, the patent officially becomes abandoned. You now enter the reinstatement period, which lasts for 12 months from the date of abandonment. Reinstating the patent at this stage is much more complex, as CIPO demands a formal written submission explaining exactly why the failure occurred.
Step 3: Drafting the “Due Care” Submission
This is the most critical step. CIPO requires evidence that you took all reasonable steps (“due care”) to ensure the fee would be paid on time. 📝 You cannot simply state that you forgot or lacked funds. You must provide a detailed timeline, affidavits, and proof of your internal tracking systems. A licensed Canadian patent agent usually drafts this submission to meet CIPO’s rigorous legal standards.
Step 4: Submitting Fees and Awaiting CIPO’s Decision
You must submit the overdue maintenance fee, the late fee, and the official reinstatement fee alongside your “due care” package. The Commissioner of Patents will review the evidence. If they accept your reasoning, your patent is revived. If they refuse, your patent rights are permanently lost in Canada.
Late Payment vs. Reinstatement Requirements
| Missed Deadline by less than 6 Months | Pay the standard maintenance fee plus a CIPO late fee. No “due care” explanation is needed. |
| Missed Deadline by 6 to 18 Months | Pay all outstanding fees, a late fee, a reinstatement fee, and submit a successful “due care” petition. |
How Much Does it Cost in Canada?
Fixing a missed CIPO deadline can be surprisingly costly. Here is a breakdown of what you can expect to pay in Canadian dollars (CAD) as of June 2026.
- Maintenance Fee: Varies depending on the anniversary of your patent, ranging from $134.02 to $1,027.00 CAD for a standard entity.
- CIPO Late Fee: A flat penalty of $150 CAD.
- CIPO Reinstatement Fee: An additional administrative fee of $297.00 CAD.
- Patent Agent Fees: Hiring a law firm to draft a complex “due care” submission generally costs between $1,500 and $4,000 CAD, depending on the complexity of the affidavits required.
How Long Does the Process Take?
Once you submit your reinstatement request, CIPO’s review process can take anywhere from 2 to 6 months. 🕘 If the Commissioner requests additional information or clarification regarding your “due care” evidence, the timeline can be extended by several more months.
Frequently Asked Questions (FAQ)
What exactly qualifies as “due care”?
Due care means you had a reliable, established system in place to track deadlines, but an unforeseeable and unavoidable event caused the failure. Examples include a catastrophic software failure, a sudden severe medical emergency of the sole docketing clerk, or a verified postal strike.
Can I reinstate my patent if I simply ran out of money?
No. Financial difficulties, bankruptcy, or choosing not to pay the fee because you were unsure of the patent’s commercial value do not meet CIPO’s threshold for due care. The failure to pay must be accidental despite your best efforts.
Do I lose my rights while the patent is abandoned?
Yes. While your patent is in a state of abandonment, your rights are suspended. If a competitor begins manufacturing your invention in Canada during this lapse, they may gain “third-party rights” protecting them from infringement lawsuits even if you later reinstate the patent.
Can a foreign lawyer file my reinstatement in Canada?
Generally, you must use a registered Canadian patent agent to interact with CIPO regarding your patent rights. A foreign lawyer cannot represent you directly before the Canadian Intellectual Property Office.
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