Teva Canada Ltd. v. Pfizer Canada Inc., 2012 SCC 60 (Supreme Court of Canada 2012)
In a November 8, 2012 decision, the Supreme Court of Canada has ruled that Pfizer's Viagra patent is void for failure to satisfy the disclosure requirement of § 27 of Canadian patent law. See, Canadian Patent 2,163,446. Apart from the major market impact, the case is doctrinally important in the way that the court treats the disclosure requirement as applying to the patented invention as a whole rather than focusing only on a claim-by-claim analysis.
The active ingredient in Viagra is sildenafil. However, the bulk of the patented claims are more broadly directed toward the use of classes of compounds that include sildenafil or sister compounds to treat erectile dysfunction (ED). Of course, of all of these potential and patented compounds, only sildenafil has been proven effective in treating ED. Further, the patent document does not particularly identify disclose that sildenafil is the compound that works.
The court found that the disclose was lacking because it did not particularly direct one skilled in the art to use the particularly important compound – sildenafil.
Considering the specification as a whole, the use of sildenafil and the other compounds for the treatment of ED comprise one inventive concept. Even though a skilled reader will know that, when a patent contains cascading claims, the useful claim will usually be at the end concerning an individual compound, the claims in the patent ended with two individually claimed compounds [only one of which is sildenafil]. There was no basis for a skilled person to determine which of Claim 6 and Claim 7 contained the useful compound, further testing would have been required to determine which of those two compounds was actually effective in treating ED.
. . .
Although s. 27 does not specify a remedy for insufficient disclosure, the quid pro quo underpinning the Act leads to the conclusion that deeming the patent invalid is the logical consequence of a failure to properly disclose the invention and how it works. If there is no quid — proper disclosure — then there can be no quo — exclusive monopoly rights.
Patent void and invalid.
