1
Wolfgang Becker, Alexander Hierweger, Hansjurgen Merkle, Erwin Lob, Joseph Lass, Wittich Kaule: Data carrier having an optical authenticity feature and methods for producing and testing said data carrier. GAO Gesellschaft fur Automation und Organisation mbH, Bacon & Thomas, August 23, 1988: US04765656 (165 worldwide citation)

The present invention relates to a data carrier (identification card, bank card, credit card, etc.) in which information is provided in an inner volume area by means of a laser beam, the information being visible in the form of changes in the optical properties of the carrier material due to an irre ...


2
Erwin Lob, Hansjurgen Merkle, Alexander Hierweger, Wolfgang Killar, Wittlich Kaule: Multilayer card-shaped data carrier and method for producing same. Gesellschaft Fur Automation Und Organisation mbH, Keck Mahin & Cate, April 19, 1994: US05304789 (80 worldwide citation)

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 marki ...


3
Hansjurgen Merkle, Joseph Lass, Alexander Hierweger, Wolfgang Killar, Erwin Lob: Multilayer data carrier and methods for writing on a multilayer data carrier. GAO Gesellschaft f Automation v Organ MBH, Robert J Koch, March 29, 1994: US05298922 (34 worldwide citation)

A multilayer identity card exhibits an outer color layer of a first color and an inner color layer of a second color to allow for identity cards and the like to be written on in several colors. While the outer color layer absorbs virtually no laser beam light used for writing, the second, inner colo ...


4
Joseph Lass, Hansjurgen Merkle, Alexander Hierweger, Erwin Lob: Multilayer identity card usable as a printing block and a method of producing it. GAO Gesellschaft fur Automation und Organisation mbH, Bacon & Thomas, April 9, 1991: US05005872 (30 worldwide citation)

An identity card is provided with a character set usable as a printing block, whereby the "natural foamability" that laser action brings about in the plastic materials commonly used for identity cards, such as PVC and polycarbonate, is exploited to obtain a relief height sufficient for a clear impre ...


5
Joseph Lass, Hansjurgen Merkle, Alexander Hierweger, Erwin Lob: Method of making a multilayer identification card usable as a printing block. GAO Gesellschaft fur Automation und Organisation mbH, Bacon & Thomas, June 16, 1992: US05122813 (23 worldwide citation)

An identity card is provided with a character set usable as a printing block, whereby the "natural foamability" that laser action brings about in the plastic materials commonly used for identity cards, such as PVC and polycarbonate, is exploited to obtain a relief height sufficient for a clear impre ...