Silica glass crucible
US11535546B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 2018 |
| Grant date | Dec 27, 2022 |
| Priority date | — |
| Expiry date | Apr 3, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C2201/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A silica glass crucible includes a cylindrical side wall portion, a curved bottom portion, and a corner portion that is provided between the side wall portion and the bottom portion and has a higher curvature than a curvature of the bottom portion, in which a first region provided from a crucible inner surface to a middle in a thickness direction, a second region that is provided outside the first region in the thickness direction and has a different strain distribution from the first region, and a third region that is provided outside the second region in the thickness direction and up to the crucible outer surface and has a different strain distribution from the second region, are provided, and internal residual stresses of the first region and the third region are compressive stresses, whereas an internal residual stress of the second region includes a tensile stress.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.