Method of rendering documents resistant to photocopying and anti

Details Method of rendering documents resistant to photocopying and anti Method of rendering documents resistant to photocopying and anti

1983-03-16

1986-12-30

Lesmes, George F.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

283902, 427 7, 427258, 428195, 428211, 428916, 430 10, 430 56, 430127, 430950, B41M 314

Patent

active

046324291

ABSTRACT:
A document has information appearing thereon, with at least a portion of the information being located on a front face of a portion of the document. The front face portion has a color with a sufficiently low reflection spectral response to render the document portion substantially incapable of being photocopied in an information-readable manner. The document portion is capable of transmitting visible light from the rear face to the front face to cause sufficient contrast between the relatively non-translucent information and the transmitted light to enable the information to be read by a human eye viewing the front face of the document when visible light is transmitted through the document from the rear face to the front face.

REFERENCES:
patent: 3597082 (1971-08-01), James et al.
patent: 3852088 (1974-12-01), Godlewski et al.
patent: 3887742 (1975-06-01), Reinnagel
patent: 4118122 (1978-10-01), Rees et al.
patent: 4175776 (1979-11-01), Ranauro
patent: 4277514 (1981-07-01), Sugiura et al.
patent: 4307899 (1981-12-01), Hoppe
patent: 4522429 (1985-06-01), Gardner et al.

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