Device with silencing circuitry
US6762688B2 · kind B2 · utility
13Cited by
18References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 8, 2002 |
| Grant date | Jul 13, 2004 |
| Priority date | — |
| Expiry date | Feb 8, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/181
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A smoke detector monitors one or more internal conditions, such as battery output voltage in detectors that include batteries. Both audible and visible indicators are energized to indicate the presence of the monitored condition or conditions. A switch or a wireless sensor on the detector can be actuated to temporarily suppress the audible indicator provided the battery exhibits an output voltage in a predetermined range, less than that of normal operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.