Keyless vehicle lock system

Details Keyless vehicle lock system Keyless vehicle lock system

1990-10-31

1992-10-20

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082532, 340540, 307 102, 342118, G08C 1900, B60R 2510, G01S 1102

Patent

active

051573890

ABSTRACT:
A keyless lock system for a vehicle includes a card for transmitting a radio signal, at least one onboard antenna for receiving the radio signal, and a control unit for allowing and preventing keyless lock and unlock operations in dependence on the existence or nonexistence of the card in a predetermined area near the antenna. The control unit monitors the position of at least one monitored door, and produces a card warning signal each time the monitored door is closed if the card is absent in the vehicle.

REFERENCES:
patent: 3725939 (1973-04-01), Saltzstein
patent: 4205325 (1980-05-01), Haygood et al.
patent: 4353064 (1982-10-01), Stamm
patent: 4428024 (1984-01-01), Mochida
patent: 4488056 (1984-12-01), Mochida
patent: 4672375 (1987-06-01), Mochida et al.
patent: 4674073 (1987-06-01), Naruse
patent: 4719460 (1988-01-01), Takeuchi et al.
patent: 4761645 (1988-08-01), Mochida
patent: 4763121 (1988-08-01), Tomoda et al.
patent: 4827744 (1989-05-01), Namazue et al.

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