Controlled authentic document recognition equipment

Details Controlled authentic document recognition equipment Controlled authentic document recognition equipment

1987-06-12

1988-05-31

Wintercorn, Richard A.

Photocopying

Miscellaneous

G03G 1500

Patent

active

047484802

ABSTRACT:
This invention relates to sensitive or classified documents utilizing specially prepared paper containing a unique substance which will, in the presence of sensors incorporated within a document copier which constantly monitor the field of view for the presence of this unique substance, interrupt the operation of this document copier. Within the copier housing, adjacent the illumination and optical apparatus, a lens gathers some of the reflected light from a document to be copied. This light is then passed through three (3) narrow band spectral filters to three (3) associated detectors. Subsequent circuitry responds to the detected light at the predetermined wavelengths, if present, and, when appropriate, interrupts the operation of the copier and/or sounds an alarm or triggers a camera.

REFERENCES:
patent: 3816118 (1974-06-01), Byrne
patent: 4486090 (1984-12-01), Warhol
patent: 4678322 (1987-07-01), Finkel et al.

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