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Pfizer's (PFE -0.2%) Viagra patent has been ruled no longer valid by Canada's top court, backing...
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Thursday, November 8, 2012, 10:24 AM ETPfizer's (PFE -0.2%) Viagra patent has been ruled no longer valid by Canada's top court, backing an appeal by generic drug maker Teva Pharmaceutical (TEVA +0.1%) that claimed PFE hadn't provided sufficient details when it initially filed its patent registration.
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