Granted Patent
Utility
US 4,289,437 · App. 06/003,014
Silo unloader lowering control
Inventor:
Glen D. Hansen
Patented Case
View Patent ↗
Granted: Sep 15, 1981
Filed: Jan 12, 1979
Inventor
Glen D. Hansen
Assignee (at issue)
Veda Incorporated
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.