Granted Patent
Utility
US 4,397,729 · App. 06/319,091
Cermet anode electrowining metals from fused salts
Inventors:
Jean-Jacques Duruz, Jean-Pierre Derivaz
Patented Case
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Granted: Aug 9, 1983
Filed: Sep 3, 1981
Inventors
Jean-Jacques Duruz
Jean-Pierre Derivaz
Assignee (at issue)
Diamond Shamrock 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.