Method for making low-expansion glass article of complex shape
US4940675A · kind A · utility
13Cited by
3References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1988 |
| Grant date | Jul 10, 1990 |
| Priority date | — |
| Expiry date | Jun 17, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B19/02
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Silica glass articles of complex shape are provided by a gel machining process wherein a silicate solution is first cast into a mold of simple shape and gelled to a fully crosslinked wet gel body, and the wet gel body is thereafter removed from the mold and machined by grinding, drilling, core drilling, water jet cutting or the like to provide a wet gelled shape of the complex configuration desired. The complex wet gel shape is then dried and consolidated, with no change in configuration (except for shrinkage), to provide a unitary crack-free glass article retaining the shape of the machined gel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.