Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-11-12
2000-02-01
Swann, Glen
Communications: electrical
Condition responsive indicating system
Specific condition
335302, 335306, 340572, G08B 13187
Patent
active
060208171
ABSTRACT:
A two-dimensional array of magnetomechanical markers is adhered to a continuous web. A magnetizer element is scanned across the web to magnetize the bias elements in a group of the markers with a first polarity, thereby activating the group of markers. The web is then advanced and the magnetizer is scanned across the web in an opposite direction to the previous scan, to magnetize the bias elements of a second group of the markers with a second polarity, thereby activating the second group of markers. The web is slit in a longitudinal direction to produce web-strips each carrying a column of the activated markers. The web-strips are rolled to form marker roll assemblies each having about half the bias elements magnetized with a first polarity and the remaining bias elements magnetized with an opposite polarity. The roll of activated markers forms no more than a minimal "leakage" magnetic field.
REFERENCES:
patent: 4510489 (1985-04-01), Anderson, III et al.
patent: 5469140 (1995-11-01), Liu et al.
patent: 5494550 (1996-02-01), Benge
patent: 5495230 (1996-02-01), Lian
patent: 5602528 (1997-02-01), Witchger
Copeland Richard L.
Lian Ming R.
Sensormatic Electronics Corporation
Swann Glen
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