Granted Patent
Utility
US 5,669,412 · App. 08/585,839
Two-piece check valve assembly
Inventor:
Daniel G. Scott
Patented Case
View Patent ↗
Granted: Sep 23, 1997
Filed: Jan 16, 1996
Inventor
Daniel G. Scott
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.