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:
Sep. 22, 2009
Filed:
May. 11, 2005
Hiroaki Morikawa, Tokyo, JP;
Shoichi Karakida, Tokyo, JP;
Takafumi Kawasaki, Tokyo, JP;
Mitsubishi Electric Corporation, Chiyoda-Ku, Tokyo, JP;
Abstract
A method of producing silicon blocks by cutting a silicon ingot is provided. The method uses a silicon ingot cutting slurry containing abrasive grains and an alkaline substance so as to provide the silicon blocks that can be produced into silicon wafers each having a thin thickness with reduced substrate damage at the time of producing a solar battery. The alkaline substance has a content mass that is at least 3.5% with respect to the mass of the entire liquid components of said slurry, and the slurry contains an organic amine having a mass ratio of 0.5 to 5.0 with respect to water in the liquid components of the slurry. The slurry is used at a pH of 12 or more and at a temperature of from 65 to 95 degrees C.