Granted Patent
Utility
US 4,468,980 · App. 06/325,499
Twin clutch pack for power shift transmission
Inventor:
Roy W. Johansen
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Nov 27, 1981
Inventor
Roy W. Johansen
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.