Alarm system

Details Alarm system Alarm system

1978-01-18

1980-02-12

Heyman, John S.

Communications: electrical

Condition responsive indicating system

With particular system function

340 63, 307247R, 3403091, 340541, 328 75, 328130, 328 48, B60R 2500, G08B 1322

Patent

active

041886216

ABSTRACT:
A control circuit utilizing: a counter which provides first and second output signals at spaced apart time intervals and delay means for stopping and starting the counter; and switch means having start and stop inputs and an output connected to the delay means of the counter. The switch means, being arranged to start the counter when the start input is energized, and being arranged to stop the counter when the stop input is energized. The stop input of the switch means being actuated by the first counter output signal.

REFERENCES:
patent: 3050708 (1962-08-01), Van Alstyne et al.
patent: 3422398 (1969-01-01), Rubin
patent: 3585584 (1971-06-01), Behrend
patent: 3636549 (1972-01-01), Berman et al.
patent: 3824480 (1974-07-01), Eshraghian
patent: 3876950 (1975-04-01), O'Connor
patent: 3936745 (1976-02-01), Harrington

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