Granted Patent
Utility
US 5,113,694 · App. 07/705,053
Modified pressure regulator valve for single car testing device
Inventor:
Gary M. Sich
Patented Case
View Patent ↗
Granted: May 19, 1992
Filed: May 23, 1991
Inventor
Gary M. Sich
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.