Granted Patent
Utility
US 4,620,259 · App. 06/683,715
Circuit for driving solenoid valve
Inventor:
Hidekazu Oshizawa
Patented Case
View Patent ↗
Granted: Oct 28, 1986
Filed: Dec 19, 1984
Inventor
Hidekazu Oshizawa
Assignee (at issue)
Diesel Kiki Co., Ltd.
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.