Lamp equipped with magnets
US4069416A · kind A · utility
Inventor
Key dates
| Filing date | Mar 29, 1976 |
| Grant date | Jan 17, 1978 |
| Priority date | — |
| Expiry date | Mar 29, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrically energized illuminating lamp having a bulb and a source of light within the bulb and emitting light through a portion of the bulb, and at least one magnet around the exterior wall of the bulb at a position other than the portion of the bulb through which light is emitted for attracting metal vapor and volatile matter generated inside the bulb during operation of the lamp and depositing them onto the interior wall of the bulb at a position corresponding to that of the magnet. Deposits are thus prevented on the interior wall of the bulb in light transmission areas thereof to reduce emission of light from the lamp. The lamp can be a mercury lamp or a filament type lamp such as an incandescent or halogen type lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.