Granted Patent
Utility
US 4,270,729 · App. 05/969,024
Top operated tank car clapper value
Inventors:
Gunter R. Behle, David P. Hillstead
Patented Case
View Patent ↗
Granted: Jun 2, 1981
Filed: Dec 13, 1978
Inventors
Gunter R. Behle
David P. Hillstead
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.