Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-10-24
1981-04-21
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340 13, 340515, 340550, 340191, G08B 1322
Patent
active
042635845
ABSTRACT:
An intruder alarm apparatus is disclosed for protecting a building or a vehicle and consuming a minimal amount of energy when in "watch" condition. An acoustic transmitter is placed inside (or outside) a closed space being supervised, an acoustic receiver is placed outside (or inside) the closed space, and an amplifier has its input connected to the receiver output and its output connected to the transmitter input. If the integrity of the closed space is broken, for example, the enclosing wall is breached, then an acoustic feedback loop is completed by a path being thus established between transmitter and receiver, such that oscillation occurs, and only now are substantial amounts of electrical energy consumed.
REFERENCES:
patent: 3065455 (1962-11-01), Roth
patent: 3721972 (1973-03-01), Hermans
patent: 3908180 (1975-09-01), Braginsky
patent: 4086586 (1978-04-01), Spirig
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