Granted Patent
Utility
US 4,169,633 · App. 05/905,962
Multi-function parking brake control valve with separated supply and control inputs
Inventor:
George Stearns
Patented Case
View Patent ↗
Granted: Oct 2, 1979
Filed: May 15, 1978
Inventor
George Stearns
Assignee (at issue)
Wagner Electric Corporation
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.