Low pressure mercury vapor discharge lamp having double layers
US5402036A · kind A · utility
9Cited by
13References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1994 |
| Grant date | Mar 28, 1995 |
| Priority date | — |
| Expiry date | Jun 1, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/48
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A low pressure mercury vapor discharge lamp is operated at a power more than 550 W/m.sup.2. The lamp has a first layer comprising first grains coated on the inner surface of the tube thereof and a second layer comprising second grains coated on the first layer. The second grains are more positive in contact electrification than the first grains. The lamp reduces an early decrease in luminous flux.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.