Interconnection of alarms of smoke detectors with distinguishable alarms
US4282519A · kind A · utility
16Cited by
2References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1977 |
| Grant date | Aug 4, 1981 |
| Priority date | — |
| Expiry date | Oct 6, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/11
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A smoke detection alarm system which has at least one detector and alarm in each of the plurality of areas with an interconnection circuit whereby upon the detection of an abnormal smoke condition in any one of the areas, the annunciator or horn of the detector in the area having the abnormal condition is operated with a steady tone and the annunciators of the other detectors in other areas are operated in an intermittent tone so that an occupant of an area can determine by the sound of the tone from the annunciator whether the abnormal condition is in the area in which he is located or in a remote area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.