Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1985-09-09
1988-05-17
LaRoche, Eugene R.
Communications: electrical
Condition responsive indicating system
Specific condition
343188, 343895, 333175, 333185, 342 51, G08B 1318
Patent
active
047454016
ABSTRACT:
A marker for use in radio frequency electronic article surveillance systems where the marker contains an inductive-capacitive resonant circuit and is made reversibly deactivatable and reactivatable by the addition of a piece of magnetic material and means, such as a piece of permanently magnetizable material, for biasing the first material to prevent alternating fields induced therein from changing the magnetic state of that material, thereby preventing hysteresis losses from causing a lowering of the Q of the resonant circuit below the point of detection.
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patent: 4658263 (1987-04-01), Urbanski
Snyder, Albers-Schoenberg, and Goldsmith; "Magnetic Ferrites-Core Materials for High Frequencies"; Electrical Manufacturing; Dec. 1949 Issue; pp. 86-91.
Barte William B.
LaRoche Eugene R.
Lee Benny T.
Minnesota Mining and Manufacturing Company
Sell Donald M.
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