Granted Patent
Utility
US 4,240,457 · App. 05/886,970
Variable flow control valve for steering systems of articulated vehicles
Inventor:
Craig W. Riediger
Patented Case
View Patent ↗
Granted: Dec 23, 1980
Filed: Mar 15, 1978
Inventor
Craig W. Riediger
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.