Viagra(R) Patent Invalidated in Canada

The Supreme Court of Canada has invalidated the patent for Viagra. The patent is invalidated because the claims do not point to the exact compound that induces penile erection in impotent males. The exact compound, sildenafil, is mentioned alongside with many others that did not achieve the desirable effect. By failing to describe the compound, the patent did not sufficiently describe the embodiment to achieve the desired effect.