Patent ID: 7744964
Filing Date: 2010-06-29
Classification: B42D,D21H,G02B,Y10T

Abstract:
1. A method for forming an optically variable device upon a substrate having a first side and a second side, the method comprising the steps of: patterning a reflective layer on the substrate using an oil-ablation technique, wherein an oil is applied to selected portions of the substrate; removing oil residue from the first side of the substrate using a first glow discharge, wherein the first glow discharge is formed from a precursor comprising oxygen; depositing thin-film layers so as to be supported by the substrate to form the optically variable device; and removing oil residue from the second side of the substrate using a second glow discharge, wherein only the first side of the substrate has been oil patterned, by application of oil to selected portions of the substrate and the oil residue results from the step of patterning the reflective layer on the first side of the substrate.