In a unanimous decision, the Supreme Court of Canada has provided valuable guidance to patent agents and litigators as to how Canadian patents will be read and enforced (Teva Canada Limited v Pfizer Canada Inc, 2012 SCC 60).
The subject matter of the patent needs no introduction. Sildenafil is the active ingredient in VIAGRA, one of the world’s best known pharmaceutical products. There is no mystery or uncertainty as to the reason VIAGRA is prescribed.
Pfizer’s patent, however, was not as . . . [more]