Articles

Pfizer’s Viagra patent partially rejected in Lilly fight

The patent on impotence drug Viagra was partially rejected after the U.S. Patent and Trademark Office said it wasn’t different
enough from a Chinese herb known as Horny Goat Weed. The patent was key to an infringement suit Pfizer filed in 2002 against
Eli Lilly and Co. over its rival Cialis drug.

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