USPTO again refuses to reissue Lipitor Patent

The USPTO has again refused to issue the lipitor patent, covering one of the major products of Pfizer. US5273995 was invalidated by the US court because of wrong dependencies of the claim. In August 2007, Pfizer had asked the USPTO to reissue the patent in order to retain its market grip on Lipitor through 2011 but this is for the second time USPTO has refused to reissue the patent.