Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1990-06-28
1992-03-03
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340541, 340546, 340565, 340554, 340636, 340693, G08B 1900, G08B 1308
Patent
active
050936506
ABSTRACT:
A portable alarm device for monitoring areas against burglary includes an alarm and a power supply connected to the alarm by an alarm circuit. A reception sensor is connected to a variable preamplifier for varying volumes of the alarm signal in accordance with the size of the area being monitored. The preamplifier is connected to at least one rejector circuit frequency filter for controlling the susceptible frequency range of the alarm trigger signals with a microprocessor connected to the rejector frequency filter to receive and transmit the signal. A signal converter is used to activate the power supply. A push button time switch is connected to the signal converter in order to delay time or readiness of the alarm for operation and the power supply is connected to the alarm through the signal converter by a closed circuit for delivering a constant low-intensity current with intermittent interruption by the signal converter.
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patent: 4943799 (1990-07-01), Papineau
Mountain West, catalog A-80, p. 6, Phoenix, Az., 1979, Mountain West Alarm Supply Co.
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