Soda-lime grey glass
US5728471A · kind A · utility
17Cited by
4References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1996 |
| Grant date | Mar 17, 1998 |
| Priority date | — |
| Expiry date | Sep 13, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C4/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Grey soda-lime glass is composed of main glass-forming constituents together with iron, selenium, cobalt and chromium as colouring agents in the following quantities: ______________________________________ Fe.sub.2 O.sub.3 0.5 to 0.9% Co 0.012 to 0.025% Se 0.0025 to 0.010% Cr.sub.2 O.sub.3 0.005 to 0.020%. ______________________________________ The proportions of colouring agents are such that the glass has a light transmission factor (TL) of less than 30% and an excitation purity (P) of less than 12%. The dark grey glass is especially appropriate for installation in the sunroofs of cars.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.