Appliance anti-theft circuitry

Details Appliance anti-theft circuitry Appliance anti-theft circuitry

1985-03-22

1987-07-14

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340687, G08B 1314

Patent

active

046805745

ABSTRACT:
The invention utilizes time domain reflectrometry to obtain a measure of the length of wire connecting an electrical appliance to its power distribution panel. An unauthorized change in this length is interpreted as an attempt to steal the appliance. Coded disabling keys are provided to allow an authorized user to unplug and move the appliance. The invention can be mounted within the appliance, requires no modification of the existing wiring or receptacles and is unaffected by power failures.

REFERENCES:
patent: 3423747 (1969-01-01), Hogencamp
patent: 3425050 (1969-01-01), Tellerman et al.
patent: 3732562 (1973-05-01), Faber et al.
patent: 4284983 (1981-08-01), Lent
patent: 4327360 (1982-04-01), Brown

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