The Federal Circuit reversed a summary judgment of infringement because it relied on an invalid "certificate of correction". The patent related to a chemical solution that keeps heart tissue alive during surgery. The certificate of correction changed "osmolarity" to "osmolality" — terms that refer to different ways to measure solution concentration. The court held the certificate invalid because it broadened the patent’s reach and corrected a non-obvious error. Central Admixture Pharmacy Services, Inc. v. Advanced Cardiac Solutions, P.C., No. 06-1307 (Fed. Cir. Apr. 3, 2007).