Pfizer Hits Hetero With Suit Over Generic Viagra

Law360, New York (July 28, 2011, 8:28 PM EDT) -- Pfizer Inc. slapped India-based Hetero Drugs Ltd. with a patent infringement suit in New York on Tuesday, raising opposition to Hetero's attempt to enter the lucrative market for its blockbuster erectile dysfunction drug Viagra.

Pfizer's complaint asserts U.S. Patent Number 6,469,012 and takes aim at Hetero as well as three Hetero subsidiaries including Hauppauge, N.Y.-based InvaGen Pharmaceuticals Inc.

The defendants infringed the '012 patent by filing an abbreviated new drug application seeking U.S. Food and Drug Administration approval to make and sell 25-milligram, 50-milligram and 100-milligram...
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