Patent · US Expired

Data carrier having an optical authenticity feature and methods for producing and testing said data carrier

US4765656A · kind A · utility

250Cited by

3References

47Claims

0Family size

Assignee

GAO Gesellschaft für Automation und organisation mbH · DE

Inventors

Wolfgang Becker · Eppstein, DE
Alexander Hierweger · Rottach-Egern, DE
Hansjurgen Merkle · Munich, DE
Erwin Lob · Munich, DE
Joseph Lass · Munich, DE
Wittich Kaule · Grafing, DE

Key dates

Filing date	Oct 15, 1986
Grant date	Aug 23, 1988
Priority date	—
Expiry date	Oct 15, 2006

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S283/904
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

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 irreversible change in the material caused by the laser beam and to a method for producing the data carrier and for testing it.

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