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Abstract

A smart card includes a control and logic unit which recognizes an interrogational signal sent to the card and automatically responds by sending an identification code. The interrogational signal is received using a noncontact communication medium in digital, bit-serial form. Input circuits connected to the logic unit convert the received signals to electrical digital input signals. Output circuits connected to the logic unit are used to transmit the identification code using a bit serial, noncontact communication medium. The control and logic unit automatically accepts the information received through the input circuits and stores the information in a writable memory in the card. The information which was stored in the memory during a previous transaction is automatically read and transmitted through the output circuits, together with the identification code. A predefined algorithm contained in the control and logic unit governs the whole process of the interrogational signal recognition, the identification code transmission, the transmission of the previous information which is stored in the memory and the new information reception and storage. The components of the smart card are integrated in a wristwatch casing to protect and conceal the card. The control and logic unit also accepts electrical signals representative of time and date from timing circuits contained in the wristwatch and performs time-dependent algorithms, like limiting the identification function to a predefined period or expiration date. The control and logic unit further accepts user commands and responds by displaying the information stored in the memory or the time and date from the timing circuits.

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First Claim