Method of deactivating a resonance label

Details Method of deactivating a resonance label Method of deactivating a resonance label

1991-07-22

1993-02-16

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

G08B 1324

Patent

active

051874660

ABSTRACT:
The method of producing an oscillating circuit on a label capable of being deactivated consists essentially of moving two surfaces of a capacitor together by a heated rod. Due to the heated rod dielectric material melts and the two capacitor surfaces become short circuited. Upon application of an appropriate current/voltage source, this short circuit is removed by burning or melting away to form a crater-like hole in a thinner surface of the capacitor. This produces a state of the label which allows, in a later deactivation step, a positive short circuiting. When the capacitor surfaces are moved together, the electrical connection between the two surfaces connects the crater forming source. Thereafter, a short circuit between the surfaces appears only when the label is passed through a deactivating station.

REFERENCES:
patent: 4686516 (1987-08-01), Humphrey
patent: 5081445 (1992-01-01), Gill et al.

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