Zoned intrusion display with series-connected sensors
US4523185A · kind A · utility
7Cited by
3References
34Claims
0Family size
Inventor
Key dates
| Filing date | Mar 15, 1982 |
| Grant date | Jun 11, 1985 |
| Priority date | — |
| Expiry date | Mar 15, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/18
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A visual display system detects and continuously displays the location of a breach in a protected building or secure area. Each of a plurality of exclusive OR gates is connected to a separate reed-type sensor switch. Each exclusive OR gate output is connected to a flip-flop network, each of which in turn is connected to a light emitting diode. Activation of a sensor switch results in lighting only of the light emitting diode associated with the area breached. A mechanism is also provided for preventing the generation of false alarms by transients or inadvertent momentary opening of any of the sensor switches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.