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. 25, 2022
Filed:
Dec. 13, 2019
Applicant:
Coorstek Kk, Tokyo, JP;
Inventor:
Ryohei Saito, Yamagata, JP;
Assignee:
COORSTEK KK, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C30B 15/10 (2006.01);
U.S. Cl.
CPC ...
C30B 15/10 (2013.01);
Abstract
The present invention relates to a silica-glass crucible for pulling up single-crystal silicon therefrom by Czochralski method (CZ method) or for melting an optical-glass, which includes a crystallization promoter, and method of producing the silica-glass crucible in which a raw-material silica powder including Al and Ca at a specific molar concentration ratio is molded.