Granted Patent
Utility
US 4,489,623 · App. 06/373,825
Axle shaft and pump drive mechanism
Inventor:
Peter Hakkenberg
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: May 3, 1982
Inventor
Peter Hakkenberg
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.