Granted Patent
Utility
US 6,227,122 · App. 09/397,584
Side frame-bolster interface for railcar truck assembly
Inventor:
Charles P. Spencer
Patented Case
View Patent ↗
Granted: May 8, 2001
Filed: Sep 16, 1999
Inventor
Charles P. Spencer
Assignee (at issue)
AMSTED INDUSTRIES INCORPORATED
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.