Patent ID: 8033477
Filing Date: 2011-10-11
Classification: B41M,B42D,G06K,H04N

Abstract:
1. An identification document comprising: a document layer comprising a material for receiving printing of thermally transferable optically variable pigment; a first indicium printed on the document layer, the first indicium being printed to the document layer by a thermally transferred optically variable pigment; the first indicium being at least partially overlaid with a second indicium printed to the document layer by a thermally transferred covert pigment, wherein the first and the second indicia are printed on the document layer by: disposing a thermally transferable optically variable pigment in a mass transfer panel of a printer ribbon configured for dye diffusion thermal transfer printing or mass transfer printing to form a first layer; disposing a thermally transferable covert pigment in the mass transfer panel to form a second layer over the first layer; printing the first and second indicia as part of a mass transfer printing process, such that, the second indicium printed in covert pigment at least partially overlays the first indicium printed in optically variable pigment; and wherein the first indicium comprises a digital image, the digital image formed by: