Arrangement to improve forgery protection of credit documents

Details Arrangement to improve forgery protection of credit documents Arrangement to improve forgery protection of credit documents

1990-11-26

1992-04-21

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

283 86, 283 94, 283108, 283904, B42D 1500

Patent

active

051061252

ABSTRACT:
A credit document with improved protection against forgery comprises a film which is attached to a local portion of a surface of the credit document. The film includes at least one security mark. The security mark comprises a micro-relief structure for optically diffracting incident light. A protection profile in the form of a macro-relief structure is also embossed into the surface of the credit document. The security mark and the protection profile overlap in part. The relief lines of the protection profile macrostructure are bent away from the plane of the surface of the credit document sufficiently to provide visible gloss effects due to the reflection of incident light. When this arrangement is utilized one or more visible breaks in the security mark occur when the security mark is removed from the credit document. In addition, the security mark is so deformed by the protection profile, that the deformation is easily visible if the security mark is attached to a second (i.e. a forged) credit document.

REFERENCES:
patent: 4250217 (1981-02-01), Greenaway
patent: 4573711 (1986-03-01), Hyde
patent: 4715623 (1987-12-01), Roule et al.

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