Two wire alarm

Details Two wire alarm Two wire alarm

2007-04-03

2007-04-03

Wu, Daniel (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C361S245000

Reexamination Certificate

active

10973510

ABSTRACT:
An alarm device that connects to a circuit using two wires and is actuated when a switch changes the status of the circuit from a normally closed circuit condition to open circuit condition. The alarm device includes a PC board with an electronic buzzer, an electronic signal transmitter and/or a visual indicator, such as a flashing LED, all of which may be enclosed within a case. The circuitry of the alarm device is non-polarized, thereby allowing the two wires to be connected to either terminal connection point in the circuit.

REFERENCES:
patent: 4740861 (1988-04-01), Droho et al.
patent: 5655561 (1997-08-01), Wendel et al.

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