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Legal Research

: The Patent Librarian's Notebook

Pfizer`s Viagra Patent Invalidated Due to Failure to Disclose

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The Supreme Court of Canada has invalidate Pfizer's Canadian patent on Viagra, citing the drug-maker's failure to disclose essential information about the main ingredient, sildenafil citrate, in the original application, which was filed in 1994 and granted in 1998. (CA 2163446) The appellant in the case was generic drug maker Teva Canada Ltd.
 
Pfizer holds several other patents related to Viagra, all of which are listed in the Canadian Drug Patent Register.

Here are a couple of stories from the Globe and Mail:

Editorial

Supreme Court backs Canadian firm?s bid to make generic Viagra

Full post as published by The Patent Librarian's Notebook on November 12, 2012 (boomark / email).

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