Granted Patent
Utility
US 4,357,840 · App. 06/196,793
Multi-speed planetary differential
Inventor:
James E. Winzeler
Patented Case
View Patent ↗
Granted: Nov 9, 1982
Filed: Mar 31, 1980
Inventor
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.