Hoffmann-La Roche and Warner Chilcott Company have filed a patent infringement suit against Sun Pharma Global with respect to 150 mg tablets of risedronate sodium (Commonly called as ‘Actonel’). The case was filed in the District Court of Delaware on December 10, 2010. The suit was filed in response to Sun’s Para IV filing for marketing approval of the patented drug asserting that the patent is invalid. The base patent with respect to the drug is set to expire in 2013.
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