Granted Patent
Utility
US 4,341,280 · App. 06/149,354
Variable displacement front wheel drive system
Inventor:
Joseph E. Dezelan
Patented Case
View Patent ↗
Granted: Jul 27, 1982
Filed: Feb 4, 1980
Inventor
Joseph E. Dezelan
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.