Ambient pressure controlled automobile alarm

Details Ambient pressure controlled automobile alarm Ambient pressure controlled automobile alarm

1995-06-07

1996-06-25

Kostak, Victor R.

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

340566, 340550, G08B 1316

Patent

active

055304192

ABSTRACT:
An automobile anti-theft alarm has an internal air pressure sensor and an external pressure sensor and a connecting electric circuit. The internal pressure sensor is mounted inside the compartment of the automobile and is connected through the electric circuit to an alarm in such a way that when the internal pressure sensor detects a pressure change the alarm will sound. The external pressure sensor is mounted outside the compartment of the automobile. Air pressure fluctuations originating outside the vehicle compartment are transmitted by the flexure of the vehicle body into the vehicle. The electric circuit is connected to an alarm and to both the inner and external pressure sensors in such a way that external air pressure fluctuations affect both sensors and the outer pressure sensor produces a voltage in the electric circuit which prevents the alarm from being activated.

REFERENCES:
patent: 4241338 (1980-12-01), Spirig
patent: 4991145 (1991-02-01), Goldstein et al.
patent: 5185543 (1993-02-01), Purand, III et al.

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