Multi-zone intrusion detection system
US3986182A · kind A · utility
55Cited by
7References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1975 |
| Grant date | Oct 12, 1976 |
| Priority date | — |
| Expiry date | Jan 21, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/1618
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultrasonic intrusion detection system having means for transmitting and receiving ultrasonic energy within a protected zone and generating an alarm when a moving object is present in the protected zone is supplemented to provide multiple independent response zones utilizing the same transmitter for all zones but individual receiver modules which can be added to the existing transmitter-receiver system to provide protection for additional independent zones with associated indicators for selectively indicating those zones which have been triggered by the presence of an intruder or other moving object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.