Fail-safe alarm circuit

Details Fail-safe alarm circuit Fail-safe alarm circuit

1986-07-01

1988-08-16

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340506, 340508, G08B 2900

Patent

active

047647540

ABSTRACT:
A fail-safe alarm system includes a device which allows current to flow in only one direction to insure that the supervisory current in an alarm circuit is flowing in the intended direction rather than in a wrong direction caused by a miswiring.

REFERENCES:
patent: 3212078 (1962-10-01), Shanahan
patent: 3448447 (1969-06-01), Tetherow
patent: 3569964 (1971-03-01), Mande
patent: 3618081 (1971-11-01), Morrow
patent: 3711854 (1973-01-01), Reynolds et al.
patent: 4118694 (1978-10-01), Right
patent: 4249166 (1981-02-01), Schultz
patent: 4253091 (1981-02-01), Frydman
patent: 4529971 (1985-07-01), James

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