Grayscale security microprinting for identification cards

Details Grayscale security microprinting for identification cards Grayscale security microprinting for identification cards

2006-01-24

2006-01-24

Frech, Karl D. (Department: 2876)

Registers

Records

C235S382000, C235S380000

Reexamination Certificate

active

06988665

ABSTRACT:
The present invention provides counterfeit resistant ID cards where a microprinting security feature is applied to the card at the time and place of card issuance. The present invention further provides for an ID card that includes microprinted security information including a code by which the authenticity of the ID card can be cross verified. In accordance with the present invention a microprint text in a grayscale gradient is placed onto an ID card using a high accuracy multi-pass thermal printing technology. In using the process of the present invention, a three pass thermal printer is used that is configured to such a high tolerance, that the grayscale gradient microprinting is possible without producing significant artifacts. When this technique is applied, any imperfections that result from the use of lower quality printing equipment become immediately identifiable reducing the ability of counterfeiters to produce fake or altered ID cards.

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