Jun 2, 2008 - Gilead Sciences, Inc. (Nasdaq:GILD) today announced that the U.S. Patent & Trademark Office (PTO) has completed the second of four reexamination proceedings and has confirmed the patentability of U.S. Patent No. 5,922,695, which covers the composition of matter for Viread (tenofovir disoproxil fumarate). On May 20, Gilead announced that the U.S. PTO confirmed the patentability of U.S. Patent No. 6,043,230.
The four U.S. PTO review proceedings were initiated July 2007 in response to a challenge issued by the Public Patent Foundation (PUBPAT) in March 2007 for U.S. Patents No. 5,922,695; 5,977,089; 5,935,946; and 6,043,230. In its request for the reexaminations, PUBPAT claimed that prior art existed that would have impacted the issuance of the original patents.
The whole story can be read here.
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