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:
Jul. 18, 2017
Filed:
Dec. 16, 2014
Applicant:
Outotec (Finland) Oy, Espoo, FI;
Inventors:
Mari Lindgren, Pori, FI;
Henri K. Virtanen, Pori, FI;
Assignee:
OUTOTEC (FINLAND) OY, Espoo, FI;
Primary Examiner:
Int. Cl.
CPC ...
C25F 3/06 (2006.01); C25C 7/02 (2006.01); C25C 7/06 (2006.01);
U.S. Cl.
CPC ...
C25F 3/06 (2013.01); C25C 7/02 (2013.01); C25C 7/06 (2013.01);
Abstract
A method for maintenance of used permanent cathode plates, said used cathode plate having scratches, crud formations and oversize grain boundaries on a surface of the cathode plate. The method comprises removing of scratches and accumulated crud from the surface of the cathode plate. The method further comprises removing substantially completely the oversize grain boundaries from the surface, and thereafter regenerating the grain boundaries of the surface of the cathode plate to an average grain boundary width of 1 to 3 μm and an average grain boundary depth less than 1 μm.