Full power light control
US5670846A · kind A · utility
7Cited by
6References
10Claims
0Family size
Inventor
Key dates
| Filing date | Aug 7, 1995 |
| Grant date | Sep 23, 1997 |
| Priority date | — |
| Expiry date | Aug 7, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A photoelectric control circuit that energizes a light bulb at a certain level of darkness and immediately records the total amount of light that results. A delay circuit prevents the new level of light from turning the bulb back off until a even greater amount of light is available. This method of operation provides full power control for a variety of lamps and bulbs without the degraded performance previously associated with reflected light from enclosures and nearby objects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.