Method for pulling a cylindrical crystal from a melt
US11965267B2 · kind B2 · utility
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2References
6Claims
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Key dates
| Filing date | Jan 24, 2020 |
| Grant date | Apr 23, 2024 |
| Priority date | — |
| Expiry date | Mar 13, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B29/06
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for pulling a cylindrical crystal from a melt by a crystal pulling unit includes measuring an actual value of a diameter of the crystal at a surface of the melt, comparing the actual value with a setpoint value for the diameter of the crystal, and setting a height of the annular gap as a function of a deviation between the actual value and the setpoint value using a first controller which has a first readjustment time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.