Granted Patent
Utility
US 5,069,663 · App. 07/681,414
Hydrocephalus valve
Inventor:
Marvin L. Sussman
Patented Case
View Patent ↗
Granted: Dec 3, 1991
Filed: Apr 4, 1991
Inventor
Marvin L. Sussman
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.