Patent · US Active

Method and device for examining a sheet-shaped or card-shaped valuable document having a security feature having one or more cavities

US9683972B2 · kind B2 · utility

2Cited by

4References

20Claims

0Family size

Assignee

GIESECKE & DEVRIENT GMBH · DE

Inventors

Jan Domke · Vaterstetten, DE
Stefan Kokrhoun · Gröbenzell, DE
Patrick Renner · Reichersbeuern, DE
André Gregarek · Munich, DE

Key dates

Filing date	Oct 25, 2012
Grant date	Jun 20, 2017
Priority date	—
Expiry date	Nov 24, 2033

Classification

Technology area (CPC G)Physics
CPC primaryG01N2291/0237
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method is for examining a sheet-shaped or card-shaped value document with a security feature having one or more cavities configured in the value document. The width of the cavity or cavities is in at least one respectively specified direction exceeding 10 μm. Transmission values are established in a locally resolved manner for the transmission of ultrasound in a specified frequency range. In employing the transmission values, it is checked whether a specified number of transmission values is greater than a specified transmission threshold value.

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