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Patent US6531114 - Sildenafil citrate chewing gum formulations and.

The Supreme Court of Canada sided Thursday with Teva Canada ., a division of the Israeli-based Teva pharmaceutical empire, in a long-standing court battle against Pfizer over whether or not the latter company has the rht to the patent in the first place.

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Canada's top court has ruled that Pfizer's patent on the company's groundbreaking erectile dysfunction drug Viagra is void.

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On February 12, 2010, the Board of Patent Appeals and Interferences (BPAI) of the U. Patent and Trademark Office (USPTO) issued an decision invalidating Pfizer’s broad claim for treating male erectile dysfunction (ED). The four granted reexaminations were merged and the fifth request was denied as it did not add anything to the merged reexamination. Chemiy, Cialis® (pyrazino-pyrido-indole-diones) and Levitra® (2-phenyl-imidazotriazinones) belong to different classes of compounds.

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Methods and chewing gum formulations for delivering a medicament, namely sildenafil citrate, to an individual are provided.


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