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:
Mar. 26, 2024
Filed:
Dec. 16, 2019
Sumco Corporation, Tokyo, JP;
Ken Kitahara, Akita, JP;
Masanori Fukui, Akita, JP;
Hiroshi Kishi, Akita, JP;
Tomokazu Katano, Tokyo, JP;
Eriko Kitahara, Akita, JP;
SUMCO CORPORATION, Tokyo, JP;
Abstract
A quartz glass cruciblehaving a cylindrical side wall portion, a bottom portion, and a corner portionincludes a transparent layeras an innermost layer made of quartz glass, a semi-molten layeras an outermost layer made of raw material silica powder solidified in a semi-molten state, and a bubble layermade of quartz glass interposed therebetween. An infrared transmissivity of the corner portionin a state where the semi-molten layeris removed is 25 to 51%, the infrared transmissivity of the corner portionin the state where the semi-molten layeris removed is lower than an infrared transmissivity of the side wall portion, and the infrared transmissivity of the side wall portionin the state where the semi-molten layeris removed is lower than an infrared transmissivity of the bottom portion