Granted Patent
Utility
US 5,100,207 · App. 07/644,354
Empty/load changeover valve with a vent passage open in the empty setting
Inventor:
Albert A. McKay
Patented Case
View Patent ↗
Granted: Mar 31, 1992
Filed: Jan 22, 1991
Inventor
Albert A. McKay
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.