Patent Examination Process: A Complete Guide for Canadian Inventors
The patent examination process is the journey your application takes from filing to a final decision — whether that’s allowance, abandonment, or appeal. Knowing each step helps inventors prepare effectively and avoid costly delays.
Step-by-Step Overview of the Patent Examination Process
Once your patent application is filed with the Canadian Intellectual Property Office (CIPO), it goes through several critical stages:
- Initial Patent Examination
Conducted by the Office of Initial Patent Examination (OIPE), this step verifies that your submission includes all required parts and formalities. If incomplete, you’ll receive a notice of missing parts.
- Art Unit Assignment
Applications are routed to an Art Unit — a group of examiners with expertise in your technology area. An examiner is assigned to your file based on the subject matter.
- Patent Publication
Your application will typically be published 18 months after the earliest filing date (unless you request otherwise). Once published, it becomes part of the public domain and accessible to everyone.
- Patent Examination Begins
The assigned examiner conducts a thorough search of prior art and determines whether your invention meets the criteria for patentability: novelty, utility, and non-obviousness.
- Office Actions & Responses
Examiners issue Office Actions detailing objections or rejections.
- 1st Office Action (Non-Final): Initial examination report.
- Applicant Response: You must respond to all issues raised.
- 2nd Office Action (Final): If objections remain unresolved.
At this point, you can:
- Submit another reply
- File a Request for Continued Examination (RCE)
- Move to appeal if disagreement remains
- Notice of Allowance or Abandonment
- Notice of Allowance: Your patent is considered allowable.
- Abandonment: Failure to respond or resolve objections leads to abandonment.
- Appeal Options
If the examiner maintains a final rejection, you may:
- Submit a Pre-Appeal Brief
- File an Appeal Brief
- Request a review by the Patent Trial and Appeal Board (PTAB)
- Ultimately, take the matter to the Federal Court
- Maintenance Fees
Even after a patent is granted, you must pay scheduled maintenance fees to keep it in force. In Canada, these are due annually starting from the second anniversary.
Patent Examiner’s Responsibilities
From the first look at your application to final decisions, patent examiners follow this structure:
Pre-Search Activities: Search Patentability & Office Position
– Read and understand the invention- Ensure the application defines the scope- Evaluate claims – Search existing technology – Identify prior art – Write Office Actions- Analyze patentability- Respond to replies- Issue allowance or abandonment
Key Terminology
- Allowed: The examiner has approved the application for issuance, but it’s not patented yet.
- Patented: The application has been issued and is enforceable.
- Abandoned: The application is no longer active due to non-response or applicant withdrawal.
- Published Application: Automatically published 18 months after filing.
- Pendency: Time from filing to allowance or abandonment.
- Art Unit: A technical group within CIPO based on your invention’s field.
Understanding the Canadian patent examination process is essential for protecting your invention efficiently. At UIPatent, we guide inventors through every stage — from drafting to examination, and beyond.
Contact us today for a free consultation on your patent filing strategy.
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