Secret optical marking

Details Secret optical marking Secret optical marking

1969-11-01

1994-11-01

Moskowitz, Nelson

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

283 91, 380 54, B42D 1500, G09C 300

Patent

active

053602358

ABSTRACT:
An optical marking system in which objects are coated with materials for purposes of applying secretly coded marks on the objects. The coating materials are transparent in daylight and have the property of absorbing ultraviolet light. When such materials are applied to a portion of the surface of an object which is a good ultraviolet reflector, only the uncoated portion reflects ultraviolet. Thus, the marked object is therefore seen as having the coated portion blocked-out when viewed through a device which filters out all but ultraviolet wavelengths but appears to be unmarked when observed without the viewing device. Similar coding of objects may be achieved by appropriately selected paints, papers and other materials.

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patent: 3455577 (1969-07-01), Kikumoto
patent: 3473864 (1969-10-01), Garbeny
patent: 3535022 (1970-10-01), Duchateau et al.
patent: 3640009 (1972-02-01), Komyama

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