Forgery resistant document with colored areas and method for thw

Details Forgery resistant document with colored areas and method for thw Forgery resistant document with colored areas and method for thw

1979-03-02

1981-07-07

Kendall, Ralph S.

Coating processes

Body member printing

283 8R, A61B 510

Patent

active

042775140

ABSTRACT:
A document with a color pattern which is resistant to forgery by photo reproducing process, at least a portion of the color pattern comprising, a coloring material having a spectral reflection factor curve which is relatively high at a wavelength in at least one of the areas below 450 nm and about 650 nm, with respect to the rest of the curve. A method is also disclosed for avoiding reproduction of a document having colored areas using photo reproducing processes.

REFERENCES:
patent: 1002600 (1911-09-01), Bawtree et al.
patent: 1692405 (1928-11-01), Freeman
patent: 3679448 (1972-07-01), Tramposch
patent: 3679449 (1972-07-01), Nagot et al.
patent: 3713861 (1973-01-01), Sharp
patent: 3852088 (1974-12-01), Godlewski et al.
patent: 4066280 (1978-01-01), La Capria

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