Granted Patent
Utility
US 5,267,589 · App. 08/043,127
Piezoelectric pressure control valve
Inventor:
Shunso F. Watanabe
Patented Case
View Patent ↗
Granted: Dec 7, 1993
Filed: Apr 5, 1993
Inventor
Shunso F. Watanabe
Assignee (at issue)
Ford Motor Company
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.