Granted Patent
Utility
US 4,769,002 · App. 06/837,333
Intercranial pressure regulator valve
Inventor:
Michael D. Hooven
Patented Case
View Patent ↗
Granted: Sep 6, 1988
Filed: Feb 28, 1986
Inventor
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.