Granted Patent
Utility
US 4,290,588 · App. 06/142,444
Apparatus for refining molten aluminum
Inventor:
John F. Pelton
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Apr 21, 1980
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.