US Patent 6032857 - Electronic money system

1. An electronic money system using IC cards for transferring electronic money by communication of a signal between said IC cards, comprising:said IC cards having a processor and first memory for storing operations to be performed by said processor in transferring electronic money, wherein said first memory stores money data values to maintain a record of money transfers between said IC cards, said money transfers between said IC cards including a deposit transfer in which money is received from one said IC card and stored in said first memory of another said IC card and a payment transaction in which electronic money stored in said first memory of said another IC card is transferred to any other one of said IC cards; andsaid IC cards having a second memory for storing information details associated with each said payment transaction.2. An electronic money system according to claim 1, wherein second memory stores said information details that further include at least one of a price, date and time for each said payment transaction.3. An electronic money system according to claim 2, wherein said second memory stores said information details that further include at least one of details relating to identifying a commodity that is part of said payment transaction, a quantity of the identified commodity and supplier identification information for the identified commodity.4. An electronic money system according to claim 1, further including said first memory storing transaction data related to each transfer of electronic money and said second memory storing said information details, said processor using said transaction data in said first memory as an index.5. An electronic money system using IC cards for transferring electronic money by communication of a signal between said IC cards, comprising:said IC cards having processor means and first memory means for storing operations to be performed by said processor in transferring electronic money, wherein said first memory stores money data values that record money transfers between said IC cards, said money transfers between said IC cards including deposit transfers in which money is received from one said IC card and stored in said first memory means of another said IC card and payment transactions in which electronic money stored in said first memory of said another IC card is transferred to any other one of said IC cards; and
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said IC cards having second memory means for storing information details associated with each of said payment transactions.6. An electronic money system according to claim 1, wherein second memory means for storing said information details further stores at least one of a price, date and time for each said payment transaction.7. An electronic money system according to claim 2, wherein second memory means for storing said information details further stores at least one of details relating to identifying a commodity that is part of said payment transaction, a quantity of the identified commodity and supplier identification information for the identified commodity.8. An electronic money system according to claim 1, further including said first memory means storing transaction data related to each transfer of electronic money and said second memory means storing said information details, said processor using said transaction data in said first memory means as an index.9. A method for recording expenses in an electronic money system using IC cards having a processor for transferring electronic money by communication of a signal between said IC cards, comprising:recording in a first memory of said IC cards money data values to maintain a record of money transfers between said IC cards, said money transfers between said IC cards including a deposit transfer in which money is received from one said IC card and stored in said first memory of another said IC card and a payment transaction in which electronic money stored in said first memory of said another IC card is transferred to any other one of said IC cards; and further, using said record of money transfers as an index, storing in a second memory information details associated with each said payment transaction that includes at least one of a price, date and time for each said payment transaction; andreading from said second memory and processing said information details with a personal computer with a program for managing expenses.


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