Granted Patent
Utility
US 6,440,193 · App. 09/862,192
Method and reactor for production of aluminum by carbothermic reduction of alumina
Inventors:
Kai Johansen, Jan A. Aune
Patented Case
View Patent ↗
Granted: Aug 27, 2002
Filed: May 21, 2001
Inventors
Kai Johansen
Jan A. Aune
Assignees (at issue)
ALCOA INC.
Elken ASA
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.