More Confusion: Switching Back
Arrhythmia Research Technology, Inc. v. Corazonix Corp. (CAFC 1992)
- Infringement action involving issued patent that was attacked by defendants as unpatentable.
- Patent - invention for analyzing electrocardiograph signals to detect a heart condition called ventricular tachycardia.
- Both methods and apparatus claims.
- District court - unpatentable subject matter
- CAFC - patentable subject matter