Alarm system with graphite sensor

Details Alarm system with graphite sensor Alarm system with graphite sensor

1994-06-06

1995-10-24

Swarthout, Brent A.

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

324525, 340429, 340566, B60R 2510

Patent

active

054613566

ABSTRACT:
An electronic alarm system using graphite sensor will be activated when the sensor is either cut, shorted, or touched. A rapid change of the sensor signal will be detected by a differential section when the sensor is touched, but not a slowly drifting sensor signal when the sensor is not touched. A comparing section takes positive or negative signal to activate the alarm system by sending a signal to a output section.

REFERENCES:
patent: 2987702 (1961-06-01), Yohe
patent: 4382252 (1983-05-01), Ohashi et al.
patent: 4926129 (1990-05-01), Wasley et al.
patent: 4931741 (1990-06-01), Koppitsch et al.
patent: 5015958 (1991-05-01), Masia et al.
patent: 5155467 (1992-10-01), Matsubara
patent: 5266924 (1993-11-01), Chung

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