Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1986-02-12
1987-07-21
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340551, G08B 1324
Patent
active
046821546
ABSTRACT:
Permanently magnetized members (24, 26) of a surveillance system label (16) are disposed adjacent a ferromagnetic nonlinear element (30) for biasing the hysteresis loop of the nonlinear element (30) near the knee (40) of the magnetization curve. The nonlinear element (30) includes low permeability sections (32,34) and high permeability section (36). The high permeability section (36) of the nonlinear element (30) is disposed adjacent a radiating dipole (28) for radiating the summation frequency of a pair of frequencies impinging on the nonlinear element (30). A memory magnet (38) with a changeable magnetism is disposed adjacent the high reluctance section (36) of the nonlinear element (30). The magnetism of the memory magnet (38) can be changed to provide either an active or inactive status of the label (16).
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Fearon Edward R.
Fearon Robert E.
Chauza Roger N.
E.A.S. Technologies, Inc.
Mills Jerry W.
Swann III Glen R.
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