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United States of America Patent
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Issued Date -
Oct 8, 2009
app pub date -
Apr 8, 2009
filing date -
Apr 8, 2008
priority date (Note) -
Abandoned
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Abstract
A holographic overlay is provided, including: a polycarbonate substrate having a first side and a second side, a diffractive structure cast upon the first side of the polycarbonate substrate, and a reflection-enhancing coating on at least a part of the diffractive structure; wherein the second side of the polycarbonate substrate provides a substantially flat external surface of the overlay capable of fusing to a conforming surface in the presence of heat and pressure without an adhesive. Optionally, the overlay is laser-engraved so as to form ablated voids in the metal coating and carbonize the laser engravable polycarbonate under the ablated voids. According to another aspect of the invention, a metal coating on a hologram is made substantially transparent using a laser to form a transparent portion of a hologram. Optionally, it is done after applying the hologram to an object such as a card, a document, etc., in register with underlying information to ensure its visibility and continuity of the hologram.
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