Granted Patent
Utility
US 4,484,528 · App. 06/310,056
Railway hopper car
Inventors:
Arthur I. Anderson, Louis J. Harvatin
Patented Case
View Patent ↗
Granted: Nov 27, 1984
Filed: Oct 9, 1981
Inventors
Arthur I. Anderson
Louis J. Harvatin
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.