Two-wire multi-zone alarm system
US4423410A · kind A · utility
20Cited by
5References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1982 |
| Grant date | Dec 27, 1983 |
| Priority date | — |
| Expiry date | Sep 2, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B25/04
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A multi-zone alarm system operative with a two-wire alarm loop and having a simple network at each alarm sensor for providing a coded signal indicative of sensor identity and relatively simple circuitry at a central location for interrogation of the remote sensors and determination of those sensors providing an alarm signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.