Timed alarming using logical inverters

Details Timed alarming using logical inverters Timed alarming using logical inverters

1977-06-21

1979-01-23

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular system function

340 63, 3403091, G08B 1322, B60R 2510

Patent

active

041363345

ABSTRACT:
A triggered before disarmed alarm system especially useful in connection with an automobile alarm uses CMOS circuitry and appropriate supply filtering having one hex-inverter integrated circuit as the only active component beside the output transistor. Diodes couple a negative immediate trigger, positive and negative delayed triggers and a disarm potential to various ones of the six inverters to render the output transistor conductive and signify an alarm condition only when an alarm condition is signified by a sequence of inputs consistent with unauthorized entry.

REFERENCES:
patent: 3858175 (1974-12-01), Kopera, Jr.
patent: 3930226 (1975-12-01), Plumberg

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