Transparent sheet containing authenticating image and method of

Details Transparent sheet containing authenticating image and method of Transparent sheet containing authenticating image and method of

1984-08-03

1987-02-24

Corbin, John K.

G02B 2700

Patent

active

046453016

ABSTRACT:
The novel transparent sheet contains at least one authenticating image, each image being viewable from the front of the sheet, but only across a cone which preferably is less than 90.degree.. The novel sheet may be adhesively bonded over information areas of a document for authenticating purposes. When such an authenticating image is viewable only from an angle appreciably different from angles at which the document is ordinarily viewed, the image is obscure in that users of the document will notice the authenticating image only when confirming the authenticity of the document. Usually each authenticating image is viewable only across a cone of about 10 to 20 degrees.

REFERENCES:
patent: 3154872 (1964-11-01), Nordgren
patent: 3503315 (1970-03-01), De Montebello
patent: 3530779 (1970-09-01), Alofs
patent: 3801183 (1974-04-01), Sevelin et al.
patent: 4082426 (1978-04-01), Brown
patent: 4099838 (1978-07-01), Cook et al.
patent: 4200875 (1980-04-01), Galanos
Burckhardt, B. and Doherty, E. T., "Beaded Plate Recording of Integral Photographs", Applied Optics, pp. 2329-2331 (Nov., 1969).

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