Granted Patent
Utility
US 4,844,122 · App. 07/240,735
Electromagnetic valve with two opposed valve seats
Inventor:
Kouji Ichihashi
Patented Case
View Patent ↗
Granted: Jul 4, 1989
Filed: Sep 6, 1988
Inventor
Kouji Ichihashi
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.