Security document circuit

US8243356B2 · kind B2 · utility

Assignee

• DE LA RUE INTERNATIONAL LIMITED · GB

Inventors

• Mats Robertsson · Stockholm, SE
• Petronella Norberg · Säter, SE
• Xin-Yong WANG · Beacon, US
• Staffan Nordlinder · Norrköping, SE
• Anna Malmström · Söderhamn, SE
• Lars-Olov Hennerdal · Västerås, SE
• James Peter Snelling · Andover, GB
• Philip George Cooper · Andover, GB

Key dates

• Filing date: Apr 30, 2008
• Grant date: Aug 14, 2012
• Expiry date: Jan 27, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49002
• WIPO field: Control
• WIPO sector: Instruments

Abstract

The authenticity of a security document, such as a bank note, is verified by use of a security feature arranged in or on the document, which security feature comprises an antenna arranged to receive EM-radiation from an external energy source; a rectifier arranged to receive electric energy from the antenna and convert it into a rectified current; and an electrochromic display arranged to alter its electrochromic state in response to said rectified current. Hence, a security feature able alter its appearance in response to EM-radiation is provided, which comprises a display that can be given a large variety of two dimensional shapes.