Energy-responsive intruder detection system
US4141008A · kind A · utility
1Cited by
1References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 21, 1977 |
| Grant date | Feb 20, 1979 |
| Priority date | — |
| Expiry date | Dec 21, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/26
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A shielded two-wire cable used to transmit signals from one or more remote receivers to a central signal processing unit in an energy-responsive system is simultaneously used to transmit from the signal processing unit to the receivers (a) a signal proportional to the system noise level, (b) a pulsating signal when the system noise exceeds a level indicative of a desired margin of safety, and/or (c) a steady-state signal when an alarm signal is generated by the signal processing unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.