Patent · US Active

Layer-type value document comprising an ink mixture in one layer

US8936846B2 · kind B2 · utility

2Cited by

10References

28Claims

0Family size

Assignee

GIESECKE & DEVRIENT GMBH · DE

Inventors

Georg Depta · Rosenheim, DE
Christof Baldus · Birkenfeld, DE
Karlheinz Mayer · Grünenbach, DE
Peter Schiffmann · Schwaz, AT

Key dates

Filing date	Apr 5, 2005
Grant date	Jan 20, 2015
Priority date	—
Expiry date	Mar 14, 2031

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/24876
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

The invention relates to a value document, especially a banknote, having a sequence of layers into which visually and/or mechanically perceptible identifiers in the form of patterns, letters, numbers or images are introduced by the action of laser radiation. According to the present invention, the sequence of layers includes a marking layer (22) composed of an ink mixture (24, 26) exhibiting a laser-radiation-absorbing mixture component (26) and a laser-radiation-transparent mixture component (24), the identifiers being visually and/or mechanically perceptible due to an irreversible change in the optical properties of the ink mixture (24, 26), effected by the action of the laser radiation.

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