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:
Jan. 10, 1984
Filed:
Jan. 27, 1982
Applicant:
Inventors:
Claude A Wilson, Rio de Janeiro, BR;
Alton T Tabereaux, Sheffield, AL (US);
Assignee:
Reynolds Metals Company, Richmond, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25C / ; C25C / ;
U.S. Cl.
CPC ...
204 67 ;
Abstract
A method of controlling alumina additions to aluminum reduction cells is disclosed. Changes in cell resistance with respect to time are measured and compared to historical values. Alumina is fed to the cell only under conditions which, based upon a statistically reliable sampling of resistance values, give a substantial reliability that an electrode upset will occur if an alumina feed is not performed.