Amendments to the Patent Rules in Canada came into force on June 2, 2007.

The amendments encourage small entities to use the patent system and provide a relief mechanism for those who mistakenly pay a fee at the small entity rate. The amended Patent Rules harmonize the Canadian Sequence Listing format with the PCT standard. The amended Patent Rules also harmonize the due dates for filing a Sequence Listing in an application that is a PCT national entry case with the requirements for an application that is not a PCT national entry case. In addition, the amended Patent Rules change the type of evidence required when an applicant who is not the inventor(s) files a patent application in Canada.