Granted Patent
Utility
US 4,728,012 · App. 06/841,152
Outlet valves for melt containing vessels
Inventor:
James H. Monks
Patented Case
View Patent ↗
Granted: Mar 1, 1988
Filed: Mar 19, 1986
Inventor
James H. Monks
Assignee (at issue)
British Steel Corporation
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.