Dual tube fluorescent lamp and light device
US6175187A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 12, 1999 |
| Grant date | Jan 16, 2001 |
| Priority date | — |
| Expiry date | Feb 12, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/34
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A dual tube type fluorescent lamp including a luminescence tube. The luminescence tube has a long and slender airtight glass bulb with a nonlinear form part, a pair of electrodes and a phosphor layer formed on the inside surface of the glass bulb. A gap is formed between the circumference of the luminescence tube and an outside glass tube. The luminescence tube encloses an electric discharge medium coating mercury and a rare gas. An inorganic substance layer is formed at least at the nonlinear form part either on the outer surface of the luminescence tube, on the inner surface of the outside glass tube, or both. The inorganic substance layer has a softening point higher than the softening point of the glass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.