Strengthened composite glass article and method of production
US3962515A · kind A · utility
6Cited by
8References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1975 |
| Grant date | Jun 8, 1976 |
| Priority date | — |
| Expiry date | Aug 21, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2964
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A composite glass article is disclosed that is composed of a TiO.sub.2 --Al.sub.2 O.sub.3 --SiO.sub.2 glass core portion encompassed within a compressively stressed, vitreous silica-type glass exterior portion. The composite is strengthened by heat treatment within the ranges of 600.degree.C. to 900.degree.C. to effect a non-reversible contraction of the core glass at temperatures below the lowest glass strain point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.