Abbott Labs. v. Andrx Pharm., Inc., No. 06-1101, __ F.3d __ (Fed. Cir. 2007).

While this is not a Northern District case, it is relevant to the Blog because it is an appeal of a Northern District case and because it confirms Judge Coar’s ruling (discussed here) that a preliminary injunction holding lacked preclusive effect in the related case Abbott Labs. v. Sandoz, Inc., No. 05 C 5373, 2006 WL 3718025 (N.D. Ill. Dec. 15, 2006).  In this patent dispute plaintiff, Abbott Laboratories ("Abbott"), alleged that defendant’s, Andrx Pharmacueticals ("Andrx") sale of a generic form of Abbott’s patented extended release antibiotic (clarithromycin, an erythromycin derivative) which Abbott markets as Biaxin XL.  The Northern District held that Abbott had established a likelihood of success on the merits of its infringement claim and that Andrx had not established a likelihood that the patent would be held invalid.  As a result of those holdings, the Northern District issued a preliminary injunction.  In its appeal, Andrx argued that Abbott was precluded from obtaining a preliminary injunction because the Federal Circuit overturned a previous Northern District preliminary injunction for Abbott against another generic antibiotic producer Teva Pharmaceuticals ("Teva").  In that case, the Federal Circuit held that Teva raised a substantial question as to the validity of the claims at issue, sufficient to call Abbott’s likelihood of success on the merits into question.  Continue Reading Federal Circuit Agrees With the Northern District: Preliminary Injunction Holdings Are Not Preclusive