Counterfeit-proof paper for discouraging attempt at reproduction

Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing electromagnetic radiation

Patent

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283902, B42D 1500

Patent

active

053758862

ABSTRACT:
A counterfeit-proof paper which discourages an attempt at reproduction of the print made thereon is disclosed. Since this paper has an apparently planar surface, the latent image contained therein escapes perception with unaided eyes. Once this paper is subjected to a copying action of a copying device, the latent image is made to appear clearly regardless of the type of copying device, the direction of scanning light, or the manner of placing the paper relative to the copying device. Specifically, either of a latent image and a background conferred upon the surface of a substratum paper is formed of mesh points of a 150-line 10% level and the remainder thereof is formed of concentric circular patterns. The thin lines forming the circles of the concentric circular patterns have a thickness of 1/10 mm and are spaced with an interval of about 1/2mm.

REFERENCES:
patent: 4780397 (1988-10-01), Tsuchiya
patent: 5078428 (1992-01-01), Maeno
patent: 5149140 (1992-09-01), Mowry, Jr. et al.
patent: 5170040 (1992-12-01), Orndorff
patent: 5193853 (1993-03-01), Wicker

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