Granted Patent
Utility
US 4,448,458 · App. 06/324,102
Shut-off cylinder for a supply accumulator of a hydraulic brake system
Inventors:
George T. Knothe, Robert Mayfield
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Nov 23, 1981
Inventors
George T. Knothe
Robert Mayfield
Assignee (at issue)
Unit Rig & Equip. 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.