Granted Patent
Utility
US 4,264,053 · App. 06/068,140
Top operated outlet valve with unitary closure guide and retainer
Inventor:
Edwin S. Carlson
Patented Case
View Patent ↗
Granted: Apr 28, 1981
Filed: Aug 20, 1979
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.