Granted Patent
Utility
US 4,303,151 · App. 06/104,005
Positive locking shift coupler
Inventor:
Ferdynand Kolacz
Patented Case
View Patent ↗
Granted: Dec 1, 1981
Filed: Dec 17, 1979
Inventor
Ferdynand Kolacz
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.