Patent ID: 6822552
Filing Date: 2004-11-23
Classification: G07C

Abstract:
An electromechanical key and lock device, comprising:a key having a mechanical code and a key electronic circuitry comprising: a key memory adapted for storing a public identification item of said key and a group identification item identifying a group of keys having identical mechanical codes, and a key contact; and a stand-alone lock having a lock electronic circuitry comprising: a lock memory adapted for storing: a list of authorized keys comprising said public identification item and a secret identification item of authorized keys, and a list of non-authorized keys comprising said public identification item of non-authorized keys, a lock contact arranged to co-operate with said key contact, and a blocking mechanism adapted to block operation of said lock unless an authorized key is inserted in the lock, wherein a key is authorized if said public and secret identification items thereof are present in the list of authorized keys and said public identification item thereof is absent in the list of non-authorized keys.