Multilayer card-shaped data carrier and method for producing same
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United States of America Patent
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Apr 19, 1994
Grant Date -
N/A
app pub date -
Oct 15, 1991
filing date -
Oct 19, 1990
priority date (Note) -
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Abstract
A multilayer card-shaped data carrier has a layer appearing black in the visible wave range, but transparent or permeable to electromagnetic radiation in the invisible wavelength spectrum outside the wavelengths substantially between about 400 and 700 nanometers. The data carrier also has data markings camouflaged by the black layer produced within or below the black layer by a lasing device, which are likewise detectable by commercial optical readers operating in the invisible wavelength spectrum outside the wavelengths substantially between about 400 and 700 nanometers.
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