Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1982-03-15
1985-06-11
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
With particular system function
340530, 340541, 340691, G08B 1308, G08B 1302
Patent
active
045231850
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.
REFERENCES:
patent: 3634846 (1972-01-01), Fogiel
patent: 3771154 (1973-11-01), Takei
patent: 3940739 (1976-02-01), Quimet
Beers R. F.
Fendelman H.
Johnston E. F.
Swann III Glen R.
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