Self-verifying transaction cards

Claim 1

A transaction or authorization card, such as a credit card, check guarantee card or identification card, said card comprising: data input means which is built into the card as a self-contained integral component card, said data input means being adapted to generate data by manual manipulation thereof by a holder of the card; memory means which is also built into the card as a self-contained integral component of the card, said memory means being adapted to be programmed with and store security coded data; programming means included in said card as a self-contained integral component of the card for the holder of the card to (1) initially enter said coded data into said memory means and (2) to enter replacement coded data for existing coded data at any time, wherein following the initial entry of said coded data, said programming means is activated only by entry of the existing coded data and a coded request for entering replacement coded data; analyzer means which is also built into the card as a self-contained integral component of the card, said analyzer means being adapted to receive data generated by said data input means and for comparing the data from said input means with the coded data held in said memory means; and indicator means which is also built into the card as self-contained integral component of said card and which is associated with said analyzer means, said indicator means being adapted to give a visual indication of acceptable use of said card when the analyzer means determines that the data which has been manually entered through said data input means by the holder of said card is the same as the coded data held in said memory of said card, said indicator means further adapted to give a visual indication to reject use of the card when the analyzer means determines that the data which has been manually entered through said data input means by the holder of said card is not the same as the coded data held in said memory means of said card.