Granted Patent
Utility
US 4,183,551 · App. 05/822,843
Differential case and push-frame assembly and a method of making same
Inventors:
George A. Fisher, Gary E. Mason
Patented Case
View Patent ↗
Granted: Jan 15, 1980
Filed: Aug 8, 1977
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.