Lamp with a bulb made of a high silica content glass
US4749902A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 3, 1986 |
| Grant date | Jun 7, 1988 |
| Priority date | — |
| Expiry date | Dec 3, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/368
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
To improve tightness of a pinch or press seal (2a; 13a, 13b) between a modenum foil and quartz or similar hard glass of an electric lamp, typically a halogen incandescent lamp or metal halide discharge lamp, an intermediate melt glass layer in form of a strip is applied to the sealing foil, which has the following main components: PA0 SiO.sub.2 : 60-70% PA0 Al.sub.2 O.sub.3 : 3-20% PA0 K.sub.2 O: 12-18, all percentages by weight, the glass being, except for trace contaminants, free from Na.sub.2 O. In a preferred form, the main components are: PA0 SiO.sub.2 : 66% PA0 Al.sub.2 O.sub.3 : 18% K.sub.2 O: 15%, all percentages by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.