Granted Patent
Utility
US 4,676,772 · App. 06/812,782
Adjustable implantable valve having non-invasive position indicator
Inventor:
Michael D. Hooven
Patented Case
View Patent ↗
Granted: Jun 30, 1987
Filed: Dec 23, 1985
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.