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. 03, 2018
Filed:
Jun. 30, 2013
Applicant:
Sumco Corporation, Minato-ku, Tokyo, JP;
Inventors:
Toshiaki Sudo, Akita, JP;
Tadahiro Sato, Akita, JP;
Ken Kitahara, Akita, JP;
Eriko Kitahara, Akita, JP;
Assignee:
SUMCO CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C30B 15/10 (2006.01); C30B 29/06 (2006.01); C03B 19/09 (2006.01);
U.S. Cl.
CPC ...
C30B 29/06 (2013.01); C03B 19/095 (2013.01); C30B 15/10 (2013.01); Y02P 40/57 (2015.11);
Abstract
A vitreous silica crucible includes: a substantially cylindrical straight body portion having an opening on a top end and extending in a vertical direction; a curved bottom portion; and a corner portion connecting the straight body portion with the bottom portion and a curvature of which is greater than that of the bottom portion, wherein an inner surface of the crucible has a concavo-convex structure in which groove-shaped valleys are interposed between ridges, and an average interval of the ridges is 5-100 μm.