Credit and identification cards having pieces of diffraction grating therein
AssigneeU.S. Banknote Corporation
InventorGilbert Colgate, Jr.
Life of this patent
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Abstract
An information bearing credit or identification card in which pieces of a diffraction grating, preferably an embossed hologram, are randomly distributed in a plastic or paper card so that light reflecting therefrom uniquely and visually differentiates the grating and hence the card. The pieces may be mixed in the plastic pig or with the paper prior to rolling or sprinkled in the plastic or other substrate during rolling.
Claims5
An information bearing card with a substrate having an extended surface with a plurality of pieces of a diffraction grating randomly distributed therein and each, in response to incident light, reflecting light having unique optical characteristics uniquely and visually identifying the grating and therefore the card source.
Dependencies are inferred from the claim text.