Patent US 5,704,046

In a commercial transaction system, a system user uses a card device to interact with sales or transaction terminals to conduct cashless transactions. Each terminal processes data including a balance stored on the card device and updates the stored data at the end of the transaction. The system is specially designed for purchases of items or transactions of relatively small monetary value, where purchases are generally unattended by salespersons. In this manner, the amount of the transaction is deducted from the balance on the card device. When the existing balance associated with the card does not cover the price of the transaction, the system provides an automatic renewal feature which automatically increases the balance of the card device by a predetermined amount. Such a feature allows the purchase to be made without inconveniencing the card user to increase the balance. Each time the balance is increased by an automatic renewal, the card issuing bank bills the card user for increments of the predetermined amount.