Granted Patent
Utility
US 5,158,091 · App. 07/621,165
Tonometry system for determining blood pressure
Inventors:
Robert D. Butterfield, Kenneth J. Pytel, Charles R. Holdaway, Stephen A. Martin
Patented Case
View Patent ↗
Granted: Oct 27, 1992
Filed: Nov 30, 1990
Inventors
Robert D. Butterfield
Kenneth J. Pytel
Charles R. Holdaway
Stephen A. Martin
Assignee (at issue)
IVAC 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.