Granted Patent
Utility
US 4,951,916 · App. 07/439,268
Pressure-balanced electromagnetic valve
Inventors:
Yasumasa Kanameda, Takeo Kushida
Patented Case
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Granted: Aug 28, 1990
Filed: Nov 20, 1989
Inventors
Yasumasa Kanameda
Takeo Kushida
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.