Treating polychromatic glass in reducing atmospheres
US4118214A · kind A · utility
19Cited by
7References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 22, 1977 |
| Grant date | Oct 3, 1978 |
| Priority date | — |
| Expiry date | Jun 22, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C23/004
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention primarily comprises an improvement upon the method for producing photosensitive colored glasses or polychromatic glasses utilizing two sequences of exposure to high energy or actinic radiation followed by heat treatment. The invention contemplates replacing the second exposure/heat treatment step with a heat treatment conducted in a reducing atmosphere at a temperature of at least 350.degree. C., but below the strain point of the glass. The resultant articles can be particularly useful in ophthalmic applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.