Granted Patent
Utility
US 4,397,444 · App. 06/215,918
Tank car bottom outlet valve having combination ring and valve seat
Inventor:
Gunter R. Behle
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: Dec 12, 1980
Inventor
Gunter R. Behle
Assignee (at issue)
ACF Industries Incorporated
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.