Granted Patent
Utility
US 4,776,642 · App. 07/116,940
Freight brake control valve device having improved quick service function
Inventors:
James E. Hart, Edward W. Gaughan, Theodore B. Hill
Patented Case
View Patent ↗
Granted: Oct 11, 1988
Filed: Nov 5, 1987
Inventors
James E. Hart
Edward W. Gaughan
Theodore B. Hill
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.