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Diffractive indicia for a surface

  • US 5,912,767 A
  • Filed: 04/12/1996
  • Issued: 06/15/1999
  • Est. Priority Date: 11/23/1993
  • Status: Expired due to Term
First Claim
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1. Diffractive indicia for a surface, comprising:

  • (a) a plurality of small separate diffractive elements, and(b) means for adhering the diffractive elements to the surface, wherein;

    each diffractive element has, before being applied to the surface a diffractive surface relief structure;

    the diffractive elements, when applied to the surface, are not separately resolvable to the human eye; and

    the appearance of the diffractive indicia, when applied to the surface, changes when the viewing angle and/or angle of illumination relative to the surface changes.

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