Double Patenting Again
Some recent court decisions have focused more attention on double patenting in Canada. Double patenting occurs when someone obtains two patents for the same (“co-terminus”) or similar (“obvious-type”) inventions. If challenged, granted patent claims can be found invalid if they are found to be double patenting over another patent owned by the applicant.
The Supreme Court of Canada has cautioned that, “If a subsequent patent issues with identical claims, there is an improper extension of the monopoly.” Many of the decisions on double patenting, including this statement from the Supreme Court arise from disputes over “old Act” patents where the . . . [more]


