Patent ID: 7880943
Filing Date: 2011-02-01
Classification: B05D,B42D,G03H,G07D

Abstract:
1. A security article comprising: a substrate; a diffractive grating directly on the surface of the substrate or upon a coating adjacent to the substrate, having a first region and a second region adjacent to the first region; wherein the first region is coated with a high refractive index (HRI) coating of a light reflecting HRI material having an index of refraction at least 1.65 and where the second region is absent the HRI material thereby forming a window above the second region of the substrate; a colored or color shifting coating supported by the substrate and visible through the window; whereby, when the article is irradiated with light, an image formed by light reflected from the colored or color shifting coating in the window provides a reference to a holographic image formed by light reflected from the HRI coating.