Granted Patent
Utility
US 5,211,451 · App. 07/884,304
Adjustable regulating device for a railway locomotive brake valve apparatus
Inventors:
Alvin J. Matthews, Thomas M. Hartzell
Patented Case
View Patent ↗
Granted: May 18, 1993
Filed: May 11, 1992
Inventors
Alvin J. Matthews
Thomas M. Hartzell
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.