Security system and signal carrying member thereof
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United States of America Patent
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Aug 22, 1989
Grant Date -
N/A
app pub date -
Dec 1, 1987
filing date -
Dec 1, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A security system comprising a signal-carrying member and a detector for detecting a change in the resistance of the conductive path surrounding a core of the signal-carrying member. The conductive path comprises inner and outer layers of semi-conductive tape separated by an insulating layer but interconnected at one end. The semi-conductive tape of at least the outer layer is made of fibrous material such as carbon-leaded PTFE such that when a sharp object pierces the outer layer and the insulating layer, semi-conductive fibers are dragged from the outer layer into contact with the inner layer and form a conductive bridge between the layers.
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