Granted Patent
Utility
US 4,557,721 · App. 06/556,150
Servo valve
Inventor:
Michael D. Hooven
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Nov 29, 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.