Granted Patent
Utility
US 4,419,015 · App. 06/235,823
Agitator having detachable wear sleeve
Inventor:
Roy Liddiard
Patented Case
View Patent ↗
Granted: Dec 6, 1983
Filed: Feb 19, 1981
Inventor
Roy Liddiard
Assignee (at issue)
Federal Signal 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.