US Patent 7328850 Financial and similar identification cards and methods relating thereto

Apparatuses forming portable identification cards and associated methods are described. A preferred apparatus includes an input device adapted for a consumer to enter authentication data, a memory for storing reference data, a processor configured to compare the authentication data entered by the consumer to the reference data stored in the memory to determine whether the authentication data entered by the consumer is valid authentication data, an indicator for informing a merchant when the processor has determined that the consumer has entered valid authentication data, and a power source adapted to supply power to the processor and the indicator. Other features are also disclosed.