Multi-tone cancellation phrase and background

Details Multi-tone cancellation phrase and background Multi-tone cancellation phrase and background

1984-07-06

1986-04-01

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

283 93, 283 94, 427 7, B42D 1500, B44F 112

Patent

active

045793700

ABSTRACT:
A protected document has a cancellation phrase, normally invisible to the human eye, which will appear if the document is copied on a color copier. The protection of these documents is improved in the following protected document. The document is made up of a substrate, first and second cancellation phrase images which form a combined cancellation phrase image printed on the substrate, first and second background images forming a combined background image printed on the substrate and a camouflage overlay image (merged with) the combined cancellation and combined background images. The first and second cancellation phrase images appear on the document when it is copied on a color copier. The two images extend the range of protection for color copy machines having multiple darkness settings.

REFERENCES:
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patent: 4310180 (1982-01-01), Mowry, Jr. et al.
patent: 4341404 (1982-07-01), Mowry, Jr. et al.
patent: 4351547 (1982-09-01), Brooks

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