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:
Jul. 29, 2025
Filed:
Oct. 30, 2020
Applicant:
Sumco Corporation, Tokyo, JP;
Inventors:
Assignee:
SUMCO CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C30B 15/10 (2006.01); C03B 20/00 (2006.01);
U.S. Cl.
CPC ...
C30B 15/10 (2013.01); C03B 20/00 (2013.01);
Abstract
A quartz glass crucible () has a structure wherein a peak of a distribution of a total concentration of Na, K, and Ca in a depth direction from an inner surface () of the crucible is present at a position deeper than the inner surface (). In an exemplary embodiment, the quartz glass crucible is capable of improving the yield of a silicon single crystal by suppressing peeling-off of brown rings.