On August 13, the Federal Circuit issued a precedential ruling in Allergan USA Inc. et al. v. MSN Laboratories Private Ltd. et al., Case Number 24-1061, U.S. Court of Appeals for the Federal Circuit. This decision reversed the District of Delaware’s application of the Federal Circuit precedent in In re: Cellect LLC to invalidate a claim in an earlier-filed parent application over admittedly patentably indistinct claims in later-filed (and earlier-expired) child patents. This decision has resolved some substantial questions about the application of obviousness-type double patenting (ODP) that had been raised by last year’s In re Cellect decision.

Case Background

Allergan, Janssen, and Eden Biodesigns (collectively, Allergan) asserted patent infringement against Sun Pharmaceuticals Industries (Sun) after Sun filed an abbreviated new drug application (ANDA) seeking U.S. Food and Drug Administration (FDA) approval to market and sell a generic version of Allergan’s bowel treatment drug, Viberzi.