Electronic key anti-theft system

Details Electronic key anti-theft system Electronic key anti-theft system

1981-10-22

1984-03-20

Trafton, David L.

Communications: electrical

Selective

Having indication or alarm

180287, 307 10AT, 340543, 34082532, B60R 2504

Patent

active

044384262

ABSTRACT:
An electronic key (A) includes an electrical plug (10) which is connected with the power, and ground, and output terminals of an encoder (20). An electrical jack (30) is adapted to receive the electronic key plug (10) to supply ground and power thereto and receive an encoded signal therefrom. A decoder (50) is connected with the jack to receive the encoded signal and produce an enable signal if the encoded signal has a preselected code. The enable signal is extended by a first latch (54) to an indefinite duration and the extended enable signal closes an enabling switch (56) and disables an alarm control (80). The enabling switch (56) allows an automotive ignition key (60) to operate the automotive ignition (62). When the enabling switch (56) and the ignition key switch (60) are closed, the first latch is reset and a second latch (68) is enabled to continue producing the enable signal of indefinite duration. When the ignition key switch (60) is opened, a delay reset circuit (70 ) resets the second latch removing the enable signal after a preselected delay. Thereafter, an electronic key which produces the preselected encoded signal must be inserted into the jack to re-enable the ignition and disable the alarm control.

REFERENCES:
patent: 3585584 (1971-06-01), Behrend
patent: 3812403 (1974-05-01), Gartner
patent: 3930226 (1975-12-01), Plumberg
patent: 4300236 (1981-11-01), Gilmour
patent: 4327353 (1982-04-01), Beard et al.
patent: 4366466 (1982-12-01), Lutz

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