The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 29, 2006
Filed:
May. 05, 2000
Inge Lidén, Eskilstuna, SE;
Rolf Norberg, Täby, SE;
Björn Magnusson, Eskilstuna, SE;
Johan Warnström, Järna, 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, Vendat, FR;
J M Thomas, Woignarue, FR;
Lance Schoell, Roanoke, VA (US);
Gilbert Andre, Torvilliers, FR;
Christian Darmanin, Troyes, FR;
Arnaud Lefebvre, Troyes, FR;
Walter Hammer, Enges, CH;
Claude-eric Jaquet, Les Joux-Derriere, CH;
Nicolas Peguiron, Le Locle, CH;
Inge Lidén, Eskilstuna, SE;
Rolf Norberg, Täby, SE;
Björn Magnusson, Eskilstuna, SE;
Johan Warnström, Järna, 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, Vendat, FR;
J M Thomas, Woignarue, FR;
Lance Schoell, Roanoke, VA (US);
Gilbert Andre, Torvilliers, FR;
Christian Darmanin, Troyes, FR;
Arnaud Lefebvre, Troyes, FR;
Walter Hammer, Enges, CH;
Claude-Eric Jaquet, Les Joux-Derriere, CH;
Nicolas Peguiron, Le Locle, CH;
Assa Abby AB, Stockholm, SE;
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.