Documents or like articles bearing holograms

Details Documents or like articles bearing holograms Documents or like articles bearing holograms

1987-12-24

1990-04-03

Arnold, Bruce Y.

G03H 100

Patent

active

049135040

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.

REFERENCES:
patent: 3623944 (1971-11-01), Davis

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