Transparent sheet containing authenticating image and method...

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

G - Physics

02

B

283/20

G02B 5/128 (2006.01) G06K 19/08 (2006.01) G06K 19/14 (2006.01) G07F 7/08 (2006.01)

Patent

CA 1250609

Abstract of the Disclosure The novel transparent sheet contains at least one authenticating retroreflective image, each image being viewable from the front of the sheet, but only across a cone which preferably is less than 90°. The novel sheet may be adhesively bonded over information areas of a document for authenticating purpose. 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.

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