Granted Patent
Utility
US 5,131,612 · App. 07/624,425
Arrangement for positively determining the actual sounding of a warning horn on a railway vehicle
Inventor:
Elmer T. Skantar
Patented Case
View Patent ↗
Granted: Jul 21, 1992
Filed: Dec 7, 1990
Inventor
Elmer T. Skantar
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.