Documents or like articles bearing holograms
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United States of America Patent
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-
Apr 3, 1990
Issued Date -
N/A
app pub date -
Dec 24, 1987
filing date -
Nov 8, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A document or like article produced by 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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