Granted Patent
Utility
US 4,269,553 · App. 06/138,021
Arbor assembly
Inventor:
James W. Drazy
Patented Case
View Patent ↗
Granted: May 26, 1981
Filed: Feb 11, 1980
Inventor
James W. Drazy
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.