Multi-candela alarm unit
US6311021A · kind A · utility
23Cited by
6References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 24, 1999 |
| Grant date | Oct 30, 2001 |
| Priority date | — |
| Expiry date | Nov 24, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B5/36
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A strobe alarm unit having a plurality of selectable candela settings or intensity levels, for allowing an alarm installer to select a particular candela setting for the alarm unit in the field. The strobe alarm unit incorporates a voltage doubler circuit that allows a single storage capacitor to provide the necessary discharge voltage across the flashtube to provide the plurality of selectable candela settings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.