Patent · US Expired

Multilayer card-shaped data carrier and method for producing same

US5304789A · kind A · utility

91Cited by

5References

16Claims

0Family size

Assignee

Gesellschaft Fur Automation Und Organisation mbH(GAO) · DE

Inventors

Erwin Lob · Munich, DE
Hansjurgen Merkle · Munich, DE
Alexander Hierweger · Rottach-Egern, DE
Wolfgang Killar · Hersbruck, DE
Wittlich Kaule · Grafing, DE

Key dates

Filing date	Oct 15, 1991
Grant date	Apr 19, 1994
Priority date	—
Expiry date	Oct 15, 2011

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB42D2033/20
WIPO fieldOther consumer goods
WIPO sectorOther fields

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.