Method of rendering documents resistant to photocopying, and ant

Details Method of rendering documents resistant to photocopying, and ant Method of rendering documents resistant to photocopying, and ant

1982-11-23

1985-06-11

Hess, Bruce H.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

162134, 162140, 162162, 283 94, 283902, 427 7, 427162, 427258, 427265, 427288, 428195, 428201, 428203, 428204, 428207, 428211, 428212, 4285375, 428913, 428916, B41M 314, B42D 1500

Patent

active

045224293

ABSTRACT:
Confidential information is printed, typed or otherwise applied to paper with a color having a reflection spectral response or less than about 10% for light with a wave-length below about 600 millimicrons. The color is sufficiently contrasting with the information to enable the information to be read by the human eye when the document is viewed under white light, but the document cannot be successfully photocopied.

REFERENCES:
patent: 4118122 (1978-10-01), Rees et al.
patent: 4175776 (1979-11-01), Ranauro
patent: 4277514 (1981-07-01), Sugiura et al.

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