A federal judge ruled that Purdue Pharma LP patents
protecting its painkiller OxyContin are invalid, clearing the way for drug maker Endo Pharmaceuticals Holdings Inc. to sell a generic version of the drug.

Purdue, based in Stamford, Conn., sued Endo for patent infringement in 2000 after Endo filed an abbreviated new drug application with the Food and Drug Administration to sell generic OxyContin, which is designed to treat moderate to severe pain.

In a 50-page opinion, U.S. District Judge Sidney H. Stein in Manhattan found that while Endo violated three of closely held Purdue’s patents on the drug, Endo “has proven by clear and convincing evidence that the patents are invalid due to Purdue’s inequitable conduct before the Patent and Trademark Office during the prosecution of the patents in suit.

http://phx.corporate-ir.net/phoenix…

Endo also has a Generic for Duragesic ready to launch, a new Sufentanyl patch in Clinical trials and OxyMorph SR in clinical trials.