Granted Patent
Utility
US 4,598,579 · App. 06/663,871
Portable instrument to test pressure/flow of ventricular shunt valves
Inventors:
Joel Cummings, Michael D. Hooven
Patented Case
View Patent ↗
Granted: Jul 8, 1986
Filed: Oct 23, 1984
Inventors
Joel Cummings
Michael D. Hooven
Assignee (at issue)
CORDIS 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.