Granted Patent
Utility
US 4,984,576 · App. 07/431,723
Circuitry for heartbeat
Inventors:
Andreas Schulenberg, Martin Schraag
Patented Case
View Patent ↗
Granted: Jan 15, 1991
Filed: Nov 2, 1989
Inventors
Andreas Schulenberg
Martin Schraag
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.