Granted Patent
Utility
US 4,374,621 · App. 06/315,970
Apparatus for controlling power delivery to a grain stirring device
Inventor:
Larry Stille
Patented Case
View Patent ↗
Granted: Feb 22, 1983
Filed: Oct 28, 1981
Inventor
Larry Stille
Assignee (at issue)
David Manufacturing Company
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.