Apparatus for deactivation of electronic article surveillance ta

Details Apparatus for deactivation of electronic article surveillance ta Apparatus for deactivation of electronic article surveillance ta

1994-08-09

1996-02-20

Peng, John K.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, 361149, 361152, 361267, G08B 1314

Patent

active

054932750

ABSTRACT:
A deactivator for deactivating electronic article surveillance tags includes a deactivating coil, drive circuitry controllable for supplying driving signals to the deactivating coil, a reference signal generator for generating a reference signal having preselected characteristics varying with time, a comparator for comparing characteristics of the driving signals with the reference signal characteristics, and a control unit for controlling the drive circuitry in accordance with signal comparisons effected by the comparator.

REFERENCES:
patent: 3983552 (1976-09-01), Bakeman, Jr. et al.
patent: 4218722 (1980-08-01), Yoshizawa
patent: 4617603 (1986-10-01), Johnson et al.
patent: 4621299 (1986-11-01), Hill
patent: 5341125 (1994-08-01), Plonsky et al.
patent: 5357398 (1994-10-01), Kamijoh

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