Patent ID: 7513433
Filing Date: 2009-04-07
Classification: B41M,B42D,G06K

Abstract:
1. A process for producing an anti-forgery security feature in a plastic personal identification card or a passport, comprising: providing a multi-layer plastic personal identification card or passport substrate having a first substrate layer and a second substrate layer, the first substrate layer having a first change-over substance dispersed therein, the first change-over substance is permanently changed from opaque to transparent upon irradiation with light of a first wavelength, the second substrate layer having a second change-over substance dispersed therein, the second change-over substance is permanently changed from opaque to transparent upon irradiation with light of a second wavelength; irradiating the first substrate layer with light of the first wavelength to form at least a first transparent anti-forgery security feature in the first substrate layer, the first transparent anti-forgery security feature extending from a top surface of the first substrate layer to a bottom surface thereof; and irradiating the second substrate layer with light of the second wavelength to form at least a second transparent anti-forgery security feature in the second substrate layer, the second transparent anti-forgery security feature extending from a top surface of the second substrate layer to a bottom surface thereof, with the first transparent anti-forgery security feature in the first substrate layer being offset from and overlapping the second transparent anti-forgery security feature in the second substrate layer wherein there is a first portion of the substrate where the first transparent anti-forgery security feature and the second transparent anti-forgery security feature overlap that is transparent from the top surface of the first substrate layer to the bottom surface of the second substrate layer, a second portion of the substrate where the first transparent anti-forgery security feature overlaps an area of the second substrate layer that is not transparent, and a third portion of the substrate where the second transparent anti-forgery security feature overlaps an area of the first substrate layer that is not transparent; wherein the first and second anti-forgery security features each comprises at least one of an image, a symbol representation or a letter/numerical code.