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System and method employing portable cards to monitor a commercial system

  • US 6,317,650 B1
  • Filed: 04/29/1999
  • Issued: 11/13/2001
  • Est. Priority Date: 04/29/1999
  • Status: Expired due to Fees
First Claim
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1. A method for a system including a first person, a second person, a card transported by the second person, and a first system, the method comprising the steps, performed by the first system, of:

  • performing a first transaction, the first transaction being for transferring title to a first item to the first person;

    subsequently, beginning a second transaction and communicating a first signal with the card, the second transaction being for transferring title to a second item to the second person; and

    writing a second signal onto the card, the second signal corresponding to a condition of the first system, the condition resulting from the first transaction.

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