Granted Patent
Utility
US 4,357,004 · App. 06/280,699
Apparatus for refining molten metal
Inventor:
John F. Pelton
Patented Case
View Patent ↗
Granted: Nov 2, 1982
Filed: Jul 6, 1981
Inventor
John F. Pelton
Assignee (at issue)
Union Carbide 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.