Patent · US Expired

Film and optical anti-counterfeiting element

US7511796B2 · kind B2 · utility

1Cited by

5References

27Claims

0Family size

Assignee

Leonhard Kurz GmbH & Co. KG · DE

Inventors

Haymo Katschorek · Herzogenaurach, DE
Mathias Seitz · Buckenhof, DE

Key dates

Filing date	Apr 8, 2004
Grant date	Mar 31, 2009
Priority date	—
Expiry date	Dec 11, 2025

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/24612
WIPO fieldOptics
WIPO sectorInstruments

Abstract

The invention concerns a film, in particular an embossing film, a laminating film or a sticker film, and an optical security element. The film has a carrier layer and a replication layer. The film also has a layer of a liquid crystal material, which is applied to the replication layer. A diffractive structure is embossed into the surface of the replication layer, which is towards the layer of a liquid crystal material, for orientation of the liquid crystal material, said diffractive structure having at least two partial regions with different directions of orientation of the embossed structure.

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