Printed matter – Having revealable concealed information – fraud preventer or... – In incorporated magnetic material
Patent
1994-09-27
1995-06-06
Han, Frances
Printed matter
Having revealable concealed information, fraud preventer or...
In incorporated magnetic material
283 86, 283 91, 283 94, 283109, 283904, 235457, 359 3, B42D 1502
Patent
active
054216184
ABSTRACT:
A plastic card provided with a magnetic stripe, which is very difficult to forge or alter and, even tough subjected to forgery or alteration, enables the forgery or alteration to be easily detected in appearance.
The plastic card comprises a card substrate and a hologram-magnetic stripe comprising, provided on said card substrate in the following order, an adhesive layer, a first magnetic recording layer, a second magnetic recording layer, a metallic reflecting layer and a hologram forming layer. The first magnetic recording layer and the second magnetic recording layer are such that one of the magnetic recording layers has a coercive force at least twice as high as the other magnetic layer and a Curie point at least 100.degree. C. below the other magnetic layer and, when the magnetic recording layers are heated at a temperature in the range of from the lower Curie point to 30.degree. C. below the lower Curie point, they become substantially identical to each other in saturation writing current value.
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Patent Abstracts of Japan, P Field, vol. 6, No. 84, May 22, 2982--JP-A-57-20903.
Kitami Koji
Okazaki Masaaki
Sasaki Yoshiki
Dai Nippon Printing Co.
Han Frances
JCB Co., Ltd.
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