Barricade flasher
US7679291B2 · kind B2 · utility
0Cited by
16References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2004 |
| Grant date | Mar 16, 2010 |
| Priority date | — |
| Expiry date | Sep 11, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A flashing warning light apparatus wherein there is provided one or more light-emitting diodes, the light-emitting diode being driven in a pulsed manner to achieve light output at a selected flash rate, with control means adapted to detect any light-induced signal from the same light-emitting diode or diodes during periods when the light-emitting diode is not emitting light, said signal being dependent on the level of ambient light. The same diode or diodes can be at a focus center of a reflector. A magnitude of any signal can then be used to determine whether the ambient light is such that the warning light should operate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.