Granted Patent
Utility
US 4,635,758 · App. 06/874,188
Hydraulic control system for simultaneous application of brakes of towing and towed vehicles with equal intensity
Inventor:
Frank A. Beard, Jr.
Patented Case
View Patent ↗
Granted: Jan 13, 1987
Filed: May 22, 1986
Inventor
Frank A. Beard, Jr.
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.