Granted Patent
Utility
US 6,039,409 · App. 08/947,799
Shutoff valve assembly
Inventor:
Thomas E. Engle
Patented Case
View Patent ↗
Granted: Mar 21, 2000
Filed: Oct 8, 1997
Inventor
Thomas E. 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.