Granted Patent
Utility
US 4,708,402 · App. 06/868,235
Brake signal conversion device for railway cars
Inventor:
Osamu Kanda
Patented Case
View Patent ↗
Granted: Nov 24, 1987
Filed: May 28, 1986
Inventor
Osamu Kanda
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.