Photocopying – Contact printing – Light boxes
Patent
1993-11-19
1995-12-12
Braun, Fred L.
Photocopying
Contact printing
Light boxes
G03G 2100
Patent
active
054754682
ABSTRACT:
A copy machine characterized in that the machine contains an illegal copying preventive image pattern storage device for storing previously an illegal copying preventive image pattern which has been previously formed on a subject with at least one IR absorption material absorbing IR, an IR transmission filter for transmitting only the IR region, an image information input device for inputting an IR image information from the reflected light of a subject to be copied, and a copying acceptance judgement device for comparing the IR image information received from the image information input device with the illegal copying preventive image pattern having been stored, and if both are coincident, performing illegal copying preventive processing, while if otherwise, performing copying processing; and an illegal copying preventive method.
REFERENCES:
patent: 3852088 (1974-12-01), Godlewski et al.
patent: 3977785 (1976-08-01), Harris
patent: 4586811 (1986-05-01), Kubo et al.
patent: 4603970 (1986-08-01), Aota et al.
patent: 4678322 (1987-07-01), Finkel et al.
Research Disclosure, No. 160, Aug. 1977, Havant GB, p. 60.
IBM Technical Disclosure Bulletin, vol. 32, No. 7, Dec. 1989, pp. 305-307.
Braun Fred L.
Toppan Printing Co. Ltd.
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