Granted Patent
Utility
US 5,520,489 · App. 08/225,383
Retractable guide assembly for changing the effective width of a railroad freight car container well
Inventors:
Ronald S. Butcher, James W. Forbes
Patented Case
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Granted: May 28, 1996
Filed: Apr 8, 1994
Inventors
Ronald S. Butcher
James W. Forbes
Assignee (at issue)
National Steel Car Limited
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.