Method of rendering objects uncopyable by photocopy processes

Details Method of rendering objects uncopyable by photocopy processes Method of rendering objects uncopyable by photocopy processes

1977-02-07

1978-10-03

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Methods

283 6, 355133, G03B 2732, B42D 1500

Patent

active

041181220

ABSTRACT:
Techniques to render documents and like objects uncopyable by photocopy means. Illumination spectral composition, object background color, and photoreceptor sensitivity are appropriately combined such that the photoreceptor perceives no object contrast. The result may be either a blackout or a whiteout of the object information.

REFERENCES:
patent: 3597082 (1971-08-01), James et al.
patent: 3852088 (1974-12-01), Godlewski et al.
patent: 3887742 (1975-06-01), Reinnagel
IBM Tech. Discl. Bulletin, "Document Copying Inhibitor Method", D. I. Weinberg, vol. 17, No. 12, May 1975, p. 3786.

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