Granted Patent
Utility
US 3,985,121 · App. 05/579,103
Heart detective
Inventor:
Samuel H. Hellenbrand
Patented Case
View Patent ↗
Granted: Oct 12, 1976
Filed: May 20, 1975
Inventor
Samuel H. Hellenbrand
Assignee (at issue)
International Telephone and Telegraph Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.