Granted Patent
Utility
US 6,558,526 · App. 09/792,728
Method of converting Hall-Heroult cells to inert anode cells for aluminum production
Inventors:
Leroy E. D'Astolfo, Robert C. Moore
Patented Case
View Patent ↗
Granted: May 6, 2003
Filed: Feb 23, 2001
Inventors
Leroy E. D'Astolfo
Robert C. Moore
Assignee (at issue)
ALCOA INC.
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.