Multilayer card-shaped data carrier and method for producing sam

Details Multilayer card-shaped data carrier and method for producing sam Multilayer card-shaped data carrier and method for producing sam

1991-10-15

1994-04-19

Sikes:, William

Registers

Records

235491, 235493, 235494, 283 85, G06K 1900, G06K 1906, B42D 1500

Patent

active

053047893

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.

REFERENCES:
patent: 4157784 (1979-06-01), Grottrup et al.
patent: 4504084 (1985-03-01), Jauch
patent: 4523777 (1985-06-01), Holbein et al.
patent: 4544181 (1985-10-01), Maurer et al.
patent: 4766026 (1988-08-01), Lass et al.

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