Granted Patent
Utility
US 4,773,447 · App. 07/066,900
Electromagnetic valve
Inventors:
Asaji Imanaka, Mitsuhiro Ikeda
Patented Case
View Patent ↗
Granted: Sep 27, 1988
Filed: Jun 25, 1987
Inventors
Asaji Imanaka
Mitsuhiro Ikeda
Assignee (at issue)
Nippon Air Brake 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.