Quality-evaluated vitreous silica crucible
US9708730B1 · kind B1 · utility
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Key dates
| Filing date | Apr 14, 2017 |
| Grant date | Jul 18, 2017 |
| Priority date | — |
| Expiry date | Apr 14, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.