Granted Patent
Utility
US 6,336,411 · App. 09/552,051
Lightweight boxcar roof
Inventor:
Edward A. Bell
Patented Case
View Patent ↗
Granted: Jan 8, 2002
Filed: Apr 19, 2000
Inventor
Edward A. Bell
Assignee (at issue)
Stanrail 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.