Granted Patent
Utility
US 6,371,417 · App. 09/486,947
Railway wheel counter and block control systems
Inventor:
Brian Southon
Patented Case
View Patent ↗
Granted: Apr 16, 2002
Filed: May 22, 2000
Inventor
Brian Southon
Assignee (at issue)
L.B. Foster Company A. Pennsylvania Corp.
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.