Granted Patent
Utility
US 4,266,628 · App. 06/069,449
Differential case and push-frame assembly
Inventors:
George A. Fisher, Gary E. Mason
Patented Case
View Patent ↗
Granted: May 12, 1981
Filed: Aug 24, 1979
Inventors
George A. Fisher
Gary E. Mason
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.