Document protection using multicolor characters

Details Document protection using multicolor characters Document protection using multicolor characters

1985-05-31

1987-05-05

Goldberg, Howard N.

Printed matter

Method

Identifying

283 74, 283 95, 283 57, 283 58, 400103, 4002412, B42D 1502, G09F 303

Patent

active

046626514

ABSTRACT:
Apparatus and method for protecting a document against unauthorized alteration comprising providing, on localized areas of a substrate, a self-contained chemical system which can produce an authorized visible message when subjected to impact pressure, and the same chemical system produces an unauthorized warning indication when any attempt is made to mechanically alter the authorized visible message.

REFERENCES:
patent: 3560229 (1971-02-01), Farnham et al.
patent: 3682673 (1972-08-01), Manske
patent: 4172605 (1979-10-01), Welsch et al.
patent: 4425386 (1984-01-01), Chang
patent: 4496961 (1985-01-01), Devrient
Research Disclosure (Nov. 1979).

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