Granted Patent
Utility
US 4,353,668 · App. 06/144,850
Hopper bottom unit
Inventor:
Arthur I. Anderson
Patented Case
View Patent ↗
Granted: Oct 12, 1982
Filed: Apr 29, 1980
Inventor
Arthur I. Anderson
Assignee (at issue)
North American Car 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.