Patents general correspondence form
From: Canadian Intellectual Property Office
On this page
This page explains how to correspond with or send documents to the Canadian Intellectual Property Office (CIPO) if you are filing a patent application or communicating with us about a patent.
For applications and patents related to section 20 of the Patent Act (items of national security), follow the necessary steps to correspond with CIPO.
If you are already familiar with this process:
What you can submit using the general correspondence form
You can electronically submit the following:
- fee payments (using credit or a deposit account)Footnote 1
- requests for the national entry of a Patent Cooperation Treaty (PCT) application
- biological sequence listings for Canadian patent applications or PCT applications
- requests to reinstate your patent application
- other documents or correspondence related to:
- changes to your postal address or email address with the Patent Office
- for each of your specific patent applications or patents, changes to the method of correspondence (postal or email)
- Canadian patent applications
- filing an international patent application through the PCT
- requesting the national entry of a PCT application
- patents in general
There are specific requirements in the Patent Rules regarding who can communicate with the Patent Office with respect to patent applications and patents for certain actions. See chapter 5 of the Manual of Patent Office Practice for additional information on representation.
Agents can do the following electronicallyFootnote 2:
- maintain the name of a patent agent on the register of patent agents
- get reinstated on the register of patent agents
- pay fees for the patent agent qualifying examination, per paper
- pay fees for the trademark agent qualifying examination
Documents must be provided in either TIFF or PDF, with the exception of biological sequence listings, which can be provided only in ASCII format. Biological sequence listings submitted under the Patent Rules in force prior to June 2, 2007, however, must also be provided in either TIFF or PDF.
Submit general correspondence
Review our system and browser requirements to make sure you have the right software.
To access the general correspondence form, you need an Innovation, Science and Economic Development Canada (ISED) account.
After you submit
Once you complete the general correspondence form, we will automatically create a letter for you addressed to the Commissioner of Patents.
CIPO will send all further national correspondence according to your preference (email or regular mail). When your correspondence relates to applications for patents that are not yet open to public inspection, you may wish to request that future correspondence be sent by regular mail.
Please advise us if you change your email address so that all future correspondence can reach the proper destination.
PCT outgoing correspondence will continue to be sent by mail.
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