Method for distinguishing printed originals from copies

Details Method for distinguishing printed originals from copies Method for distinguishing printed originals from copies

1990-03-02

1991-11-12

Yost, Frank T.

Printed matter

Method

283 92, 283902, B42D 1500

Patent

active

050642219

ABSTRACT:
In order to distinguish originals from copies, a method adds substances to printing medium that produces markings, which are not visible to the naked eye and are only recognizable by using special scanners.

REFERENCES:
patent: 3614430 (1971-10-01), Berler
patent: 3628271 (1971-12-01), Carrell
patent: 3886083 (1975-05-01), Laxer
patent: 4066280 (1978-01-01), LaCapria
patent: 4429318 (1984-01-01), Kobata
patent: 4451521 (1984-05-01), Kaule et al.
patent: 4522429 (1985-06-01), Gardner et al.
patent: 4627642 (1986-12-01), Peronneau et al.
patent: 4791449 (1988-12-01), Foley et al.

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