Documents containing information invisible to the naked eye

Details Documents containing information invisible to the naked eye Documents containing information invisible to the naked eye

1984-01-30

1985-03-12

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing superposed layers

283 91, 283901, 283 17, B42D 1500

Patent

active

045040842

ABSTRACT:
A document is disclosed, which contains information invisible to the naked eye, but which information can be made visible by a simple method. Said information is represented by markings on the document, which markings comprise a first color at least partially opaque to at least part of the invisible light spectrum, and a second color which serves to conceal said first color in the visible spectrum, but which second color is itself transparent to said part of the invisible light spectrum.

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patent: 3919447 (1975-11-01), Kilmer, Jr. et al.
patent: 3973788 (1976-08-01), Pekko et al.
patent: 4014602 (1977-03-01), Ruell
patent: 4017834 (1977-04-01), Cuttill et al.
patent: 4098940 (1978-07-01), Groh et al.
patent: 4118122 (1978-10-01), Rees et al.
patent: 4119361 (1978-10-01), Greenaway
patent: 4140373 (1979-02-01), Rull
patent: 4157784 (1979-06-01), Grottrup et al.

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