Back up alarm system

Details Back up alarm system Back up alarm system

1977-08-01

1979-02-20

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340 63, 325 64, 307 10AT, B60R 2510

Patent

active

041410092

ABSTRACT:
Electrically conductive leads electrically connect a relay, a source of electrical energy and a radio transmitter for transmitting radio signals in a back up circuit with a burglar alarm. The relay is electrically connected to the electric circuit of a burglar alarm system and is maintained unenergized by said system so that the relay is normally open. When an electrical conductor of the burglar alarm circuit is energized, the relay is energized and closes the back up circuit to actuate the transmitter to transmit radio signals indicating that an electrical conductor of the burglar alarm circuit has been energized.

REFERENCES:
patent: 3893069 (1975-07-01), Mason
patent: 4012728 (1977-03-01), Fowler

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