Patent · US Expired

Security element

US7054043B2 · kind B2 · utility

44Cited by

1References

31Claims

0Family size

Assignee

GIESECKE & DEVRIENT GMBH · DE

Inventors

Christoph Mengel · Mainz, DE
Desanka Gacesa · Miesbach, DE
Max Voit · Weilheim, DE

Key dates

Filing date	Sep 18, 2003
Grant date	May 30, 2006
Priority date	—
Expiry date	Sep 18, 2023

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S359/90
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

The invention relates to an object of value with a security element having at least a first and a second liquid-crystalline material, the first material having thermochromic properties and the second material an optically variable effect.

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