Granted Patent
Utility
US 4,402,181 · App. 06/214,639
Hydraulic drive system for a vehicle
Inventors:
Alvin W. Acker, Clyde R. Headrick
Patented Case
View Patent ↗
Granted: Sep 6, 1983
Filed: Dec 10, 1980
Inventors
Alvin W. Acker
Clyde R. Headrick
Assignee (at issue)
Allis-Chalmers Corporation
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.