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:
Apr. 26, 2011
Filed:
Apr. 23, 2008
Applicants:
Erik Enebakk, Kristiansand, NO;
Kenneth Friestad, Kristiansand, NO;
Ragnar Tronstad, Sogne, NO;
Cyrus Zahedi, Sandvika, NO;
Christian Dethloff, Oslo, NO;
Inventors:
Erik Enebakk, Kristiansand, NO;
Kenneth Friestad, Kristiansand, NO;
Ragnar Tronstad, Sogne, NO;
Cyrus Zahedi, Sandvika, NO;
Christian Dethloff, Oslo, NO;
Assignee:
Elkem AS, Oslo, NO;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B 33/02 (2006.01); C01B 33/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The silicon feedstock for solar cells is made from metallurgical grade silicon by the successive steps of treating the silicon with a calcium-silicate slag, solidifying the treated silicon, leaching the solid silicon with acid, remelting the leached silicon, resolidifying the remelted silicon into an ingot, removing the upper part of the ingot and then crushing and sizing.