Granted Patent
Utility
US 5,437,422 · App. 08/015,144
Railway signalling system
Inventor:
Greogory D. Newman
Patented Case
View Patent ↗
Granted: Aug 1, 1995
Filed: Feb 9, 1993
Inventor
Greogory D. Newman
Assignee (at issue)
Westinghouse Brake and Signal Holdings 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.