The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 20, 2002
Filed:
Dec. 01, 2000
Applicant:
Inventors:
Vittorio De Nora, Nassau, BS;
Jean-Jacques Duruz, 1204 Geneva, CH;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25C 3/08 ;
U.S. Cl.
CPC ...
C25C 3/08 ;
Abstract
A non-carbon, metal-based slow-consumable anode of a cell for the electrowinning of aluminium self-forms during normal electrolysis an electrochemically-active oxide-based surface layer ( ). The rate of formation ( ) of the layer ( ) is substantially equal to its rate of dissolution ( ) at the surface layer/electrolyte interface ( ) thereby maintaining its thickness substantially constant, forming a limited barrier controlling the oxidation rate ( ). The anode ( ) usually comprises an alloy of iron with at least one of nickel, copper, cobalt or zinc which during use forms an oxide surface layer ( ) mainly containing ferrite.