Granted Patent
Utility
US 4,286,684 · App. 06/189,958
Hydraulic servo steering system
Inventor:
Lawrance F. Berg
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Mar 3, 1980
Inventor
Lawrance F. Berg
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.