Flashlight with a backup system
US4803605A · kind A · utility
71Cited by
9References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1987 |
| Grant date | Feb 7, 1989 |
| Priority date | — |
| Expiry date | Aug 4, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21S9/022
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A hand-held flashlight has a housing for two independent electrical systems: a primary system and a backup system. Each of the systems includes a light source, a power source and a switching device for selectively connecting a power source to a corresponding light source. The backup system uses high performance components to insure that the flashlight is operational for long time periods. The backup system is actuated only after the the primary system has failed. An indicator announces when the backup system is in operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.