Browse Prior Art Database

Security Shield

IP.com Disclosure Number: IPCOM000083164D
Original Publication Date: 1975-Apr-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Godlewski, RB: AUTHOR

Abstract

Card documents such as vehicle registrations, drivers licenses, and checks have been altered by carefully erasing certain written or imprinted characters and inserting different ones in their place. Also, document falsification can be accomplished by using the correct colored inks and adding fluorescent pigments or dyes where appropriate. Identifying an altered or falsified document has required the use of such equipment as ultraviolet lights, chlorinated solutions or abrasive materials.

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Security Shield

Card documents such as vehicle registrations, drivers licenses, and checks have been altered by carefully erasing certain written or imprinted characters and inserting different ones in their place. Also, document falsification can be accomplished by using the correct colored inks and adding fluorescent pigments or dyes where appropriate. Identifying an altered or falsified document has required the use of such equipment as ultraviolet lights, chlorinated solutions or abrasive materials.

The present security shield eliminates the need for ultraviolet lights to detect authenticity or alterations, while the document still contains most of the standard safety features. The security shield is a double-gravure printed background for documents which utilizes a unique combination of special inks. The first down ink or undercoat is a very opaque, erasable, light pale green that is printed with reverse type. The second down ink or top coat is a light transparent green which is also erasable and printed with either a "C" or "G" tint design.

When looking at the face of the printed security shield document, the undercoat ink is not apparent but validity or eraser detection can be made by holding the document up to a light and looking through the back of it, to inspect for the correct word or design and any tampering of it. Protection is enhanced by the fact that both coatings will erase and both coatings will develop brown with an eradicator.

Examples of func...