Method for equipping papers of value with authenticity features

US5897746A · kind A · utility

Assignee

• GIESECKE & DEVRIENT GMBH · DE

Inventors

• Thomas Attenberger · Poing, DE
• Dieter Stein
• Gerhard Stenzel · Germering, DE
• Wilhelm Ilgmann · Wolfratshausen, DE

Key dates

• Filing date: Mar 25, 1997
• Grant date: Apr 27, 1999
• Expiry date: Mar 25, 2017

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H23/50
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

In a method for providing papers of value with authenticity features, a homogeneous mixture is produced in a defined concentration from a feature substance present in powder form and a gas. This mixture is ejected at high speed from at least one nozzle disposed at a given distance from the paper web and transferred onto the running paper web.