Document having an optical-diffraction authenticating element

Details Document having an optical-diffraction authenticating element Document having an optical-diffraction authenticating element

1983-09-21

1986-02-04

Corbin, John K.

Printed matter

Maps

35016223, 283 91, 283904, 428 30, G02B 518, G02B 532, B42D 1502, B44F 112

Patent

active

045681414

ABSTRACT:
A document includes a substrate which has an outer surface and defines a plane, and a coordinate system which is defined with respect to the plane. A diffraction-optical authenticating element covers at least part of the outer surface, and generates at least one color pattern constituting a visually testable feature which verifies the authenticity of the document. The diffraction-optical authenticating element provides a color pattern moving at a predetermined velocity along a predetermined track when the document is illuminated from a first direction and viewed from a second direction, as defined with respect to the coordinate system, upon the document being rotated within the plane along a prearranged sense of rotation, and at a prearranged velocity.

REFERENCES:
patent: 1996539 (1935-04-01), Dufay
patent: 3412493 (1968-11-01), French
patent: 4094575 (1978-06-01), Kellie
patent: 4119361 (1978-10-01), Greenaway
patent: 4129382 (1978-12-01), Greenaway
patent: 4184700 (1980-01-01), Greenaway

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