Registers – Systems controlled by data bearing records – Credit or identification card systems
Patent
1978-12-07
1980-04-01
Cook, Daryl W.
Registers
Systems controlled by data bearing records
Credit or identification card systems
235493, 235382, G06K 500, G06K 1906
Patent
active
041957717
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.
REFERENCES:
patent: 3790754 (1974-02-01), Black et al.
patent: 4150781 (1979-04-01), Silverman et al.
patent: 4151405 (1979-04-01), Peterson
Cook Daryl W.
Metalimphy
LandOfFree
Method of identifying articles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of identifying articles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of identifying articles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1309961