Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing electromagnetic radiation
Patent
1988-02-24
1989-09-19
Watts, Douglas D.
Printed matter
Having revealable concealed information, fraud preventer or...
Utilizing electromagnetic radiation
283902, 427 7, 428916, B42D 1500, G09F 303, B41M 314, B41M 120
Patent
active
048674818
ABSTRACT:
Paper is provided with resistance to photocopying or transmission by telefacsimile by spatial spectral modulation of the paper reflectance at a specific single or preferably multiple frequencies. Such paper has a colored pattern of at least two colors repeating in at least one dimension of a face of a paper with at least one frequency in the range of from about 0.5 to about 50 times per cm. The colors contrast with black or similar dark color to permit black or similar dark colored information to be visible readable when applied to the colored pattern. The colors also cooperate with such information to provide a document resistant to photocopying and transmission by telefacsimile.
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patent: 4632429 (1986-12-01), Gardner et al.
Delbridge Robert F.
Fors Arne I.
Heyrana Sr. Paul M.
Nocopi International Inc.
Watts Douglas D.
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