Patent · US Expired

Document with an unforgeable surface

US4988126A · kind A · utility

48Cited by

11References

23Claims

0Family size

Assignee

GAO Gesellschaft für Automation und organisation mbH · DE

Inventors

Christoph Heckenkamp · Munich, DE
Gerhard Stenzel · Germering, DE
Wittich Kaule · Grafing, DE

Key dates

Filing date	Nov 25, 1988
Grant date	Jan 29, 1991
Priority date	—
Expiry date	Nov 25, 2008

Classification

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

Abstract

Documents and data, patterns, etc., applied thereto, which are present in the form of a surface relief, in particular in the form of embossed characters, are provided partially in the area of this surface relief with luminescent substance which is testable visibly and by machine. The luminescent substance is introduced either into raised or into depressed areas of the surface relief, so that characteristic features of the surface relief are reflected in its spatial distribution. The data can thus be tested for falsification and at the same time for authenticity in a simple way.

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