Granted Patent
Utility
US 6,604,470 · App. 09/621,304
Center beam car with deep upper beam structure
Inventor:
James W. Forbes
Patented Case
View Patent ↗
Granted: Aug 12, 2003
Filed: Jul 20, 2000
Inventor
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.