Patent · US Expired

Device for evaluating diffractive authenticity features

US6750465B2 · kind B2 · utility

2Cited by

9References

11Claims

0Family size

Assignee

BUNDESDRUCKEREI GMBH · DE

Inventors

Arnim Franz-Burgholz · Berlin, DE
Roland Gutmann · Falkensee, DE
Harald Hoeppner · Berlin, DE
Thomas Loer · Berlin, DE
Detlef Martens · Berlin, DE
Gunther Dausmann · Erding, DE
Zishao Yang · Erding, DE
Robert Massen · Schallstadt, DE
Thomas Franz · North Canton, US
Thomas Leitner · Dortmund, DE
Jörg Eberhardt · Tettnang, DE

Key dates

Filing date	Nov 25, 2002
Grant date	Jun 15, 2004
Priority date	—
Expiry date	Dec 7, 2022

Classification

Technology area (CPC G)Physics
CPC primaryG03H1/0011
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

An apparatus for evaluating distinguishing authenticity features comprising diffraction elements on a document which is illuminated by an illumination source. The distinguishing authenticity element which is to be examined, diffracts the beam of the illuminating source and projects it onto an evaluating unit in the device. In order to be independent of the nature and location of the diffraction pattern, the diffraction pattern derived from the document to be examined is projected onto a screen and the image of the pattern recorded and evaluated by a camera (matrix or cells).

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