Objects to be checked for authenticity, and method and apparatus

Details Objects to be checked for authenticity, and method and apparatus Objects to be checked for authenticity, and method and apparatus

1994-05-16

1997-02-11

Hajec, Donald T.

Registers

Records

Magnetic

235449, G06K 1912

Patent

active

056023812

ABSTRACT:
An object to be checked contains a large number of magnetic polymer elements scattered at random. Each of magnetic polymer elements is made up of an element main body formed of a high molecular material, and magnetic metal powder contained in the element main body. The magnetic polymer elements are integrally incorporated in paper and tangled with the wood pulp fibers of the paper three-dimensionally. In the manufacturing process of the object, a processing apparatus magnetically scans the magnetic polymer elements incorporated in the scanning region of the object while moving the scanning region at a predetermined speed, converts a detection signal obtained by the magnetic scan into a cipher code, and records the cipher code in a code indicator section. In the authenticity checking process, the processing apparatus magnetically scans the magnetic polymer elements once again, and a detection signal obtained thereby is collated with the cipher code recorded in the code indicator section. When the detection signal and the cipher code agree with each other, the object is determined as being authentic.

REFERENCES:
patent: 4094462 (1978-06-01), Moschner
patent: 4114032 (1978-09-01), Brosow et al.
patent: 4138057 (1979-02-01), Atalla
patent: 4218674 (1980-08-01), Brosow et al.
patent: 4450348 (1984-05-01), Stockburger et al.
patent: 4527051 (1985-07-01), Stenzel
patent: 4820912 (1989-04-01), Samyn
patent: 5204526 (1993-04-01), Yamashita et al.
patent: 5350558 (1994-09-01), Kawato et al.
patent: 5352764 (1994-10-01), Mackey
patent: 5434917 (1995-07-01), Naccache et al.

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