Key and lock device

US7099474B1 · kind B1 · utility

Assignee

• Assa Abby AB · SE

Inventors

• Inge Lidén · Eskilstuna, SE
• Rolf Norberg · Täby, SE
• Björn Magnusson · Eskilstuna, SE
• Johan Warnström · Munkfors, SE
• Reijo Hakkarainen · Joensuu, FI
• Hannu Sivonen · Marjovaara, FI
• Gudrun Brennecke · Berlin, DE
• Christophe Chanel · Berlin, DE
• Jens Gürtler · Rangsdorf, DE
• Jürgen Krühn · Berlin, DE
• Alain Varenne · Vichy, FR
• J M Thomas · Abbeville, FR
• Lance Schoell · Radford, US
• Gilbert Andre · Torvilliers, FR
• Christian Darmanin · Troyes, FR
• Arnaud Lefebvre · Troyes, FR
• Walter Hammer · Newtown, US
• Claude-Eric Jaquet · La Chaux-de-Fonds, CH
• Nicolas Peguiron · Le Locle, CH

Key dates

• Filing date: May 5, 2000
• Grant date: Aug 29, 2006
• Expiry date: May 5, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G07C2009/00761
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A key and lock device comprises a key having a first electronic circuit and a lock having a second electronic circuit. The key and the lock store secret information, some of which is unique for each device. The key and the lock exchange a random number through connectors and perform a calculation in the respective circuitry based on the random number and secret information. An electrical blocking mechanism is moved to a non-blocking position if a comparison of the calculations in the circuits gives the correct result.