Granted Patent
Utility
US 4,434,680 · App. 06/262,054
Planetary steering differential
Inventors:
Craig W. Riediger, James E. Winzeler
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: Sep 2, 1980
Inventors
Craig W. Riediger
James E. Winzeler
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.