Granted Patent
Utility
US 4,784,178 · App. 06/948,437
Valve unit
Inventors:
Masashi Kasaya, Tatsuhiko Abe
Patented Case
View Patent ↗
Granted: Nov 15, 1988
Filed: Dec 31, 1986
Inventors
Masashi Kasaya
Tatsuhiko Abe
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.