Granted Patent
Utility
US 4,313,643 · App. 06/113,011
Emergency brake system employing shuttle valve
Inventor:
Vern R. Exley
Patented Case
View Patent ↗
Granted: Feb 2, 1982
Filed: Jan 18, 1980
Inventor
Vern R. Exley
Assignee (at issue)
Joy Manufacturing Company
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.