Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1991-04-24
1993-03-16
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
G08B 1324
Patent
active
051948494
ABSTRACT:
A process and circut device for the deactivation and subsequent proof of a resonance label which has a resonant circuit with a certain Q factor and a certain frequency. The resonant circuit is energized with and disabled by a deactivation energy during deactivation. During deactivation, time is divided into a continuous alternating sequence of first and second time periods which directly follow one another. A transmission antenna transmits a deactivation energy during each of the first periods of time in the form of a sequence of separate deactivation impulses to cause the reosnant circuit of the resonance label to oscillate in a resonant mode. The height and the width of each of the deactivation impulses and the number of the deactivation impulses within the impulse sequence are such that the impulse sequence delivers sufficient energy to deactivate the resonance label. The transmission is stopped and the transmission antenna is disabled for each of the second periods of time. A receiver is activated at the beginning of each of the second periods of time. The receiver receives decaying oscillations of a resonant label which is present and which has not successfully been deactivated during the preceding of the first time period.
REFERENCES:
patent: 5023600 (1991-06-01), Szklany et al.
patent: 5027106 (1991-06-01), Lizzi et al.
patent: 5059951 (1991-10-01), Kaltner
Actron Entwicklungs AG
Swann III Glen R.
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