Colored photochromic glasses and method
US4240836A · kind A · utility
71Cited by
5References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1979 |
| Grant date | Dec 23, 1980 |
| Priority date | — |
| Expiry date | Nov 19, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/913
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Surface-colored photochromic glass articles produced by reduction heat treatments at 450.degree. C. and below which exhibit induced absorption peaks at longer wavelengths than prior art glasses, and surface colors such as orange, red, purple and blue, are described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.