Patent · US Expired

Valuable document

US6858323B1 · kind B1 · utility

5Cited by

3References

20Claims

0Family size

Assignee

GIESECKE & DEVRIENT GMBH · DE

Inventors

Thomas Giering · Kirchseeon, DE
Rainer Hoppe · Nuremberg, DE
Thomas Attenberger · Poing, DE

Key dates

Filing date	May 23, 2000
Grant date	Feb 22, 2005
Priority date	—
Expiry date	May 23, 2020

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2991
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

The invention relates to a document of value, such as a paper of value, ID card or the like, having at least one authenticity feature in the form of a luminescent substance. The luminescent substance has particles consisting of a dye-laden molecular sieve whose structure forms an optical resonator. In said resonator at least one dye can be excited to show stimulated emission, the dye being incorporated in the cavities of the molecular sieve or located in or on the internal and external surfaces of the molecular sieve, and the transition to stimulated emission being accompanied by a detectable change in the luminescent properties of the dye.

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