Ultraviolet absorbing and yellow light filtering glasses for lamp envelopes
US6323585A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 1999 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | May 3, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C2201/36
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention is directed at a family of glasses capable of absorbing UV radiation and filtering yellow light in the visible region of the spectrum, the family of glasses having a composition consisting essentially, in terms of weight percent on the oxide basis, of: 55-95.7% SiO.sub.2, 0-28% B.sub.2 O.sub.3, 0.5-18% Al.sub.2 O.sub.3, 0-4% SrO, 0-13% BaO, 0-13% CaO, 0-8% MgO, 0-7.5% Na.sub.2 O, 0-9.5% K.sub.2 O, 0-1.5% Li.sub.2 O, 0-1.5% Sb.sub.2 O.sub.3, 0.4-4.5% Nd.sub.2 O.sub.3, and 0.1-1% CeO.sub.2. Glasses of the present invention are capable of employment as envelopes for tungsten-halogen lamps and other high temperature light sources, as well as sealed-beam incandescent headlights.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.