Granted Patent
Utility
US 4,772,173 · App. 06/834,948
Silo unloader
Inventors:
Floyd E. Buschbom, Glen D. Hansen
Patented Case
View Patent ↗
Granted: Sep 20, 1988
Filed: Feb 28, 1986
Inventors
Floyd E. Buschbom
Glen D. Hansen
Assignee (at issue)
Vandale, Inc.
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.