Schering Corp. v. Geneva Pharmaceuticals — Metabolite of Patented Drug Inherently Anticipated by Prior Art, Cannot Be Separately Patented
The Federal Circuit held that Schering’s patent on a metabolite of Claritin (loratadine) was invalid because the metabolite is necessarily and inherently formed when a patient takes a dose of the previously patented loratadine — establishing that inherent anticipation does not require recognition in the prior art.