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:
May. 17, 1983
Filed:
May. 21, 1981
Applicant:
Inventor:
Nolan E Richards, Florence, AL (US);
Assignee:
Reynolds Metals Company, Richmond, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25C / ; C25B / ;
U.S. Cl.
CPC ...
2042 / ; 204294 ;
Abstract
An improved alumina reduction cell is described in which the carbonaceous cathode includes refractory hard metal tiles projecting upwardly from the cell surface thereof, forming the true cathode surface, and a solid layer of alumina and cryolite beneath the molten aluminum produced within the cell and the alumina-cryolite bath from which the molten aluminum is obtained. This bottom alumina-cryolite layer protects the refractory hard metal-carbonaceous interface from attack by the molten aluminum, increasing the useful life of the cell.