Granted Patent
Utility
US 5,971,498 · App. 08/772,327
Electro-pneumatic valve control
Inventor:
Thomas H. Engle
Patented Case
View Patent ↗
Granted: Oct 26, 1999
Filed: Dec 23, 1996
Inventor
Thomas H. Engle
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.