Granted Patent
Utility
US 4,392,032 · App. 06/258,058
Rotating paddle bin level indicator
Inventor:
Donald E. Roach
Patented Case
View Patent ↗
Granted: Jul 5, 1983
Filed: Apr 28, 1981
Inventor
Donald E. Roach
Assignee (at issue)
Berwind 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.