Anti-theft apparatus for vehicles

Details Anti-theft apparatus for vehicles Anti-theft apparatus for vehicles

1982-12-22

1986-06-17

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

34082531, 455 1, 455 26, B60R 2500, G06F 704

Patent

active

045959021

ABSTRACT:
In an anti-theft apparatus for vehicles with wireless transmission of the code signal, the latter is suitably overlapped outside of the vehicle by a secondary signal which is not to be received in or on the vehicle. This results in an effective protection against interception of the code signal.

REFERENCES:
patent: 3703714 (1972-11-01), Andrews
patent: 3760422 (1973-09-01), Zimmer et al.
patent: 3879709 (1975-04-01), Yukawa
patent: 4104694 (1978-08-01), Hargrove
patent: 4106006 (1979-08-01), Atkins
patent: 4143368 (1979-03-01), Route et al.
patent: 4258352 (1981-03-01), Lipschutz
patent: 4307400 (1981-12-01), Miley
patent: 4383242 (1983-05-01), Sassover et al.
patent: 4397034 (1983-08-01), Cox et al.

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