Invention Grant
- Patent Title: Quality-evaluated vitreous silica crucible
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Application No.: US15488342Application Date: 2017-04-14
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Publication No.: US09708730B1Publication Date: 2017-07-18
- Inventor: Toshiaki Sudo , Tadahiro Sato , Ken Kitahara , Masami Ohara
- Applicant: SUMCO CORPORATION
- Applicant Address: JP Tokyo
- Assignee: SUMCO CORPORATION
- Current Assignee: SUMCO CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Law Office of Katsuhiro Arai
- Main IPC: G01N21/00
- IPC: G01N21/00 ; C30B15/10 ; C30B29/06 ; C30B15/14 ; C30B15/00 ; C30B35/00 ; G01N21/65

Abstract:
A quality-evaluated vitreous silica crucible for pulling silicon single crystal is provided, wherein an inner surface of the vitreous silica crucible has regions where surface defects including brown rings are to be generated when pulling silicon single crystal. The regions are distinguished using an infrared absorption spectrum or a Raman shift of the regions, wherein a position of each region and/or a density of the regions are/is specified.
Public/Granted literature
- US20170218534A1 QUALITY-EVALUATED VITREOUS SILICA CRUCIBLE Public/Granted day:2017-08-03
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