Process for providing holograms on documents or the like
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United States of America Patent
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Mar 1, 1988
Issued Date -
N/A
app pub date -
Feb 7, 1986
filing date -
Nov 8, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process which provides a three-dimensional, light-diffracting pattern comprising a hologram on a surface of a transparent material layer which may be extremely thin and non-self-supporting, and which secures this layer to a document or like substrate, with the pattern-bearing surface facing downwardly (i.e., not exposed), by an adhesive bond having a shear strength greater than that of the transparent layer so that the layer cannot be removed from the surface without being destroyed.
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