Circuitry for portable lighting devices and portable rechargeable electronic devices
US7723921B2 · kind B2 · utility
5Cited by
75References
20Claims
0Family size
Inventor
Key dates
| Filing date | Feb 8, 2006 |
| Grant date | May 25, 2010 |
| Priority date | — |
| Expiry date | Feb 28, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/0031
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A portable electronic device, such as a flashlight, with a circuit for reducing the initial surge of current that is sent through the lamp filament when a flashlight is turned on is provided. The circuit reduces the stresses placed on the lamp bulb when it is turned on, thereby extending the life expectancy of the lamp bulb. A flashlight with beacon mode that produces light according to a duty cycle of less than 11% is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.