Theftproof device

Details Theftproof device Theftproof device

1982-09-16

1987-01-27

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

340568, 250221, 2502221, 250227, 350 961, B60R 2500, G08B 1314, G01V 904, H01J 516

Patent

active

046397132

ABSTRACT:
A theftproof device comprising a flexible tying member, an optical fiber extending through the flexible tying member, a light emission element arranged opposite an end of the optical fiber, a light receiving element arranged opposite the other end of the optical fiber, a fixture fixed to an object to be protected from theft, an electrical circuit arranged within the fixture, mechanical connector means for mechanically connecting the flexible tying member to the fixture, and electrical connector means for electrically connecting the light emission element and the light receiving element to the electrical circuit. The electrical circuit is responsive to a change in a photo signal generated by the light emission element and transmitted through the optical fiber, for performing a warning function.

REFERENCES:
patent: 3792284 (1974-02-01), Kaelin
patent: 4262284 (1981-04-01), Stieff et al.
patent: 4284290 (1981-08-01), Ragsdale
patent: 4309639 (1982-01-01), Thrower, Jr. et al.
patent: 4340007 (1982-07-01), Hogwn

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