Photocopying – Miscellaneous
Patent
1975-01-06
1976-08-31
Moses, R. L.
Photocopying
Miscellaneous
250556, G03B 1500
Patent
active
039777855
ABSTRACT:
A simple optical correlation system for preventing unauthorized copying of selected documents wherein documents (and copy paper) comprise paper having coded information thereon (visible or invisible) which is optically correlated with a protection device within a copying machine. When light emanating from the copying machine light source is directed to the document, light transmitted from the coded area of the document, which may comprise the entire page area, is sensed by optical detectors within the machine. A reference pattern is positioned between the document and the optical detectors. When the document code and the reference pattern are correlated, the output signal from the reference document is detected and coupled to appropriate circuitry wherein the copying machine is allowed to initiate a copying sequence. If the code on the document and the pattern on the reference document are not correlated, the copying machine is inhibited from operation.
REFERENCES:
patent: 3713861 (1973-01-01), Sharp
patent: 3831007 (1974-08-01), Braun
patent: 3852088 (1974-12-01), Godlewski et al.
IBM Tech. Disclosure Bulletin, Boggs et al., Copier Incorp. Doc. Detect. System, vol. 15, No. 7, 12- 72.
Keschner Irving
Moses R. L.
Ralabate James J.
Weiss Franklyn C.
Xerox Corporation
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