Optical: systems and elements – Holographic system or element – Authentication
Patent
1998-01-27
1999-09-21
Spyrou, Cassandra C.
Optical: systems and elements
Holographic system or element
Authentication
359 22, 359567, 359900, 283 86, 264 131, 264 134, 428 30, G03H 102
Patent
active
059561645
ABSTRACT:
Graphic material includes at least one area bearing a hologram and at least one area bearing a diffraction grating. Preferably, the diffraction grating and the hologram are simultaneously viewable from at least one perspective. The graphic material is made using an embossing die grown from a precursor blank which has been embossed in discrete areas with a holographic microtexture and then partially overstamped with a diffraction grating microtexture. The stamping of the blank may be effected by pressing a suitably shaped die against a shim bearing a diffraction grating microtexture for forming the microtexture in the die shape on the blank.
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Coburn Corporation letter dated Jul. 9, 1984.
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Copy of "Panda" Hologram, Light Impressions, Copyright 1984.
Newswanger, C., "A brief historical review of the use of diffraction gratings as decoration", SPIE, 1995, 2333, 218-225.
The Diffraction Company, Inc., Riderwood, Maryland, Information Package including literature on products, sample drawings, and price lists, items contain several dates: 1966, 1972, 1986, and 1987, 32 pages.
Agreement between Diffraction Company, Inc. and Crown Roll Leaf, Inc., Agreement made Jun. 30, 1986, 2 pages.
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Crown Roll Leaf Inc.
Jr. John Juba
Spyrou Cassandra C.
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