Gao Gesellschaft Fur Automation Und Organisation Mbh

Wittlich Kaule

Erwin Lob

Hansjurgen Merkle

Alexander Hierweger

Wolfgang Killar

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.

Growing community of inventors

Emmering, Germany

Wittlich Kaule