Granted Patent
Utility
US 4,291,808 · App. 06/215,853
Roller conveyor-classifier
Inventor:
Carl A. Roloff
Patented Case
View Patent ↗
Granted: Sep 29, 1981
Filed: Dec 12, 1980
Inventor
Carl A. Roloff
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.