Granted Patent
Utility
US 4,741,730 · App. 06/432,502
Hydrocephalus shunt with in-line filter
Inventors:
Ray H. Dormandy, Jr., Harold J. Hoffman
Patented Case
View Patent ↗
Granted: May 3, 1988
Filed: Oct 4, 1982
Inventors
Ray H. Dormandy, Jr.
Harold J. Hoffman
Assignee (at issue)
American Hospital Supply Corp.
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.