Granted Patent
Utility
US 4,240,607 · App. 05/969,523
Top operated tank car lading valve also operable from the bottom
Inventor:
Edwin S. Carlson
Patented Case
View Patent ↗
Granted: Dec 23, 1980
Filed: Dec 14, 1978
Inventor
Edwin S. Carlson
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.