Dual technology intruder detection system
US4660024A · kind A · utility
63Cited by
2References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1985 |
| Grant date | Apr 21, 1987 |
| Priority date | — |
| Expiry date | Dec 16, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/16
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A dual-tech intruder detection system includes a pair of intruder-detecting subsystems, each functioning to detect intrusion by a technology different from the other, and apparatus for activating an alarm in response to both subsystems detecting intrusion within a predetermined time interval. A supervisory circuit serves to detect a malfunction in one of the subsystems. Default apparatus, responsive to the output of the supervisory circuit, causes the alarm activating apparatus to activate an alarm in response to the still functioning subsystem's detection of intrusion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.