US 5,374,976 · Granted 1994-12-20
Support provided with a machine detectable copying security element
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.
Patent details
- Publication number
- US 5,374,976
- Filing date
- 1993-08-12
- Grant date
- 1994-12-20
- Assignee
- Joh. Enschede En Zonen Grafische Inrichting B.V.
- Inventor(s)
- SPANNENBURG; SIJBRAND
- CPC class
- H04N1/00875
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