Granted Patent
Utility
US 5,740,547 · App. 08/604,032
Rail navigation system
Inventors:
Robert C. Kull, Roger P. Woodward
Patented Case
View Patent ↗
Granted: Apr 14, 1998
Filed: Feb 20, 1996
Inventors
Robert C. Kull
Roger P. Woodward
Assignee (at issue)
Westinghouse Air Brake Co.
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.