Granted Patent
Utility
US 4,596,273 · App. 06/722,303
Double-seat electromagnetic valve
Inventor:
Shuji Kiyoshima
Patented Case
View Patent ↗
Granted: Jun 24, 1986
Filed: Apr 11, 1985
Inventor
Shuji Kiyoshima
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.