Granted Patent
Utility
US 6,551,489 · App. 09/759,949
Retrofit aluminum smelting cells using inert anodes and method
Inventors:
Leroy E. D'Astolfo, Giuseppe Lazzaro
Patented Case
View Patent ↗
Granted: Apr 22, 2003
Filed: Jan 12, 2001
Inventors
Leroy E. D'Astolfo
Giuseppe Lazzaro
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.