Regulating cylinder unit in a single-crystal pulling apparatus and a jig for installing them
US5928422A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1998 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Mar 9, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T117/1072
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Regulating cylinder unit is divided into three parts, a third regulating cylinder shaped essentially like a cylinder and installed on the protection cylinder; a first regulating cylinder and a second regulating cylinder which are shaped like reversed truncated cones with different diameters and are capable of engaging with the third regulating cylinder. In addition, the second and third regulating cylinders are brought together in a preset ordering, that is, a flange formed at the outer peripheral rim of the upper end of the second regulating cylinder is engaged with a stepped portion of the third regulating cylinder, and a flange formed at the outer peripheral rim of the upper end of the first regulating cylinder is engaged with a flange formed at the inner peripheral rim of the lower end of the second regulating cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.