Granted Patent
Utility
US 5,207,482 · App. 07/737,103
Vent valve device having disabling means
Inventors:
James E. Hart, Williard P. Spalding
Patented Case
View Patent ↗
Granted: May 4, 1993
Filed: Jul 29, 1991
Inventors
James E. Hart
Williard P. Spalding
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.