Process for providing holograms on documents or the like

Details Process for providing holograms on documents or the like Process for providing holograms on documents or the like

1986-02-07

1988-03-01

Czaja, Donald E.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Contour or profile photography to reproduce...

156233, 156240, 283904, 35016217, 428203, B44C 116, B44C 117, G02B 518, B32B 300

Patent

active

047283777

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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