Granted Patent
Utility
US 4,267,749 · App. 06/084,289
Compact reversible variable speed transmission and differential
Inventors:
Robert O. Chambers, Robert N. Stedman
Patented Case
View Patent ↗
Granted: May 19, 1981
Filed: Oct 12, 1979
Inventors
Robert O. Chambers
Robert N. Stedman
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.