Method of identifying articles
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United States of America Patent
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-
Apr 1, 1980
Grant Date -
N/A
app pub date -
Dec 7, 1978
filing date -
Dec 23, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In the identification of an article provided with at least one identifying magnetic member, each identifying member is selected from one or more production batches each of which has a characteristic hysteresis loop which is virtually non-reproducible. The member is subjected to analysis of its magnetic characteristics which are compared with those of a reference magnetic means comprising the same number of magnetic members from the same batches as the identifying magnetic members. Identical characteristics provide a correct identification. The detection apparatus may comprise two exciter coils for providing two alternating magnetic fields and two detector coils for each field connected in opposition. When an identifying magnetic member inserted in one field is identical to the reference magnetic member inserted in the other field, detection signals from the two detector coils cancel each other out.
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