DNJ Rejects Double-Patenting Claim

Last week, in Gilead Sciences, Inc. v. Natco Pharma Ltd., the District of New Jersey ruled on summary judgment that Gilead Sciences did not unlawfully extend its patent protection on oseltamivir (Tamiflu), a neuraminidase inhibitor used to treat the flu, covered by U.S. Patent No. 5,763,483 (“the ‘483 patent”). Natco Pharma sought to invalidate the ‘483 patent for obviousness-type double patenting in its attempt to market a generic version of Tamiflu prior to the patent’s expiration. Natco had alleged, inter alia, that the claims of the ‘483 patent were invalid due to obviousness-type double-patenting over Gilead’s later issued U.S. Patent No. 5,952,375 (“the ‘375 patent”).