Support provided with a machine detectable copying security elem

Details Support provided with a machine detectable copying security elem Support provided with a machine detectable copying security elem

1993-08-12

1994-12-20

Grimley, A. T.

Photocopying

Contact printing

Light boxes

283 72, 283 94, 283901, 283902, 355200, G03G 2100, B42D 1500

Patent

active

053749766

ABSTRACT:
A support provided with a machine-detectable security element, particularly a copying-security element. The security element comprises a first image perceptible to the human visual system, said first image incorporating a second image that is substantially imperceptible to the human visual system.

REFERENCES:
patent: 4168088 (1979-09-01), Somlyody
patent: 4175774 (1979-11-01), Tonges et al.
patent: 4210346 (1990-07-01), Mowry, Jr. et al.
patent: 4227719 (1980-10-01), McElligott et al.
patent: 4310180 (1982-01-01), Mowry, Jr. et al.
patent: 4579370 (1986-04-01), Corwin et al.
patent: 4891666 (1990-01-01), Gordon
patent: 5078428 (1992-01-01), Maeno

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