Communications: electrical – Selective – Having indication or alarm
Patent
1973-01-30
1976-10-19
Caldwell, John W.
Communications: electrical
Selective
Having indication or alarm
180114, 307 10AT, 340224, B60R 2504, G08B 108
Patent
active
039874087
ABSTRACT:
An anti-theft system for cars and the like. A receiver is mounted in the trunk of the vehicle. A first receiver wire is connected to the electrical system of the car for supplying power to the receiver only when the ignition switch is turned on. A second, normally grounded, receiver wire is extended to the ignition coil for preventing operating of the ignition system. To remove the ground from this second conductor, it is necessary to operate a small transmitter while the ignition switch is turned on. The transmitter and the receiver are sold as a pair, the receiver being tuned to recognize a coded signal from only the paired transmitter. Once the ignition system is turned on, the disabling ground potential is held removed from the second conductor even though the transmitter is no longer operated. When the ignition system is subsequently turned off, the disabling potential is automatically applied to the second conductor and the anti-theft system is re-armed with no action being required of the driver other than the turning off of the ignition switch. A key-operated switch is provided on the receiver to allow the driver to de-activate the system when that is desired, for example, when the car is parked in a public garage.
REFERENCES:
patent: 3142166 (1964-07-01), Adam et al.
patent: 3175192 (1965-03-01), Keltner
patent: 3268817 (1966-08-01), Hagey
patent: 3337992 (1967-08-01), Tolson
patent: 3588858 (1971-06-01), Demuth
patent: 3604005 (1971-09-01), Gilmore
patent: 3611287 (1971-10-01), Hoff et al.
patent: 3646515 (1972-02-01), Vodehnal
patent: 3675036 (1972-07-01), Davis
Irizarry Mario
Sassover Nathan
Caldwell John W.
Nowicki Joseph E.
TMX, Inc.
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