Granted Patent
Utility
US 3,991,847 · App. 05/604,570
Steering system for an articulated vehicle
Inventor:
Dale H. Unruh
Patented Case
View Patent ↗
Granted: Nov 16, 1976
Filed: Aug 14, 1975
Inventor
Dale H. Unruh
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.