Granted Patent
Utility
US 4,690,463 · App. 06/853,519
Freight brake control valve having an emergency piston slide valve arranged to provide an accelerated brake application function
Inventor:
James E. Hart
Patented Case
View Patent ↗
Granted: Sep 1, 1987
Filed: Apr 18, 1986
Inventor
James E. Hart
Assignee (at issue)
American Standard Inc.
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.