Atorvastatin: Pfizer sued Teva in the District Court of Delaware

Pfizer sued Teva in the District Court of Delaware for the Infringement of US 5273995 ("[R-(R*R*)]-2-(4-fluorophenyl)-beta, delta-dihydroxy-5-(1-methylethyl-3-phenyl-4-[(phenylamino) carbonyl]- 1H-pyrrole-1-heptanoic acid, its lactone form and salts thereof," issued December 28, 1993) based on Teva's filing of an ANDA to manufacture a generic version of Pfizer's Lipitor® (Atorvastatin hemicalcium). This is second time Pfizer has sued Teva for the same patent for different strength. The CAFC on complaint from Ranbaxy has invalidated the claim 6 of this patent. Pfizer is trying to reissue the said patent and USPTO has twice rejected Pfizer request as reported earlier by this blog