Passive action antitheft device

Details Passive action antitheft device Passive action antitheft device

1992-06-18

1994-01-18

Swarthout, Brent

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

180287, B60R 2510

Patent

active

052802671

ABSTRACT:
An antitheft device for vehicles includes a central unit able to inhibit or enable normal function of the vehicle engine responsive to a coded radio signal emitted by a portable unit activated by a radio signal emitted by the central unit. The central unit includes a first memory, a device to transmit at a first frequency a first coded radio signal, CODE 3 chosen at random from a list of codes stored in the first memory device and to receive and recognize a second coded radio signal CODE 4. The portable unit includes a control and command device including a second memory device to receive and recognize the first coded radio signal, CODE 3, emitted by the central unit, a device to transmit at a second frequency a second coded radio signal, CODE 4, chosen in a list of codes stored in said second memory and tied to the first coded radio, signal CODE 3. The central unit is able to command the deactivation of the device which inhibits the engine of the vehicle responsive to the said second coded radio signal.

REFERENCES:
patent: 4652860 (1987-03-01), Weishaupt et al.
patent: 4738334 (1988-04-01), Weishaupt
patent: 4754255 (1988-06-01), Sanders et al.
patent: 4931664 (1990-06-01), Knoll
patent: 5055701 (1991-10-01), Takeuchi

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