Granted Patent
Utility
US 4,284,309 · App. 06/093,078
Brake control valve having operator feedback
Inventor:
Wayne A. Hoefer
Patented Case
View Patent ↗
Granted: Aug 18, 1981
Filed: Aug 13, 1979
Inventor
Wayne A. Hoefer
Assignee (at issue)
Caterpillar Tractor Co.
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.