Granted Patent
Utility
US 4,540,400 · App. 06/515,700
Non-invasively adjustable valve
Inventor:
Michael D. Hooven
Patented Case
View Patent ↗
Granted: Sep 10, 1985
Filed: Jul 21, 1983
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.