Secure credit card
First Claim
1. A portable identification device having a code display means and a processing system mounted unitarily, said processing system having identification input means,masking means over said code display means, said masking means in a first mode preventing visual reading of said code display means, and in a second mode permitting visual reading of said code display means,said processing system having means to cause said masking means to switch from said first mode to said second mode.
1 Assignment
0 Petitions
Accused Products
Abstract
A credit card resistant to unlawful use has a code, indicative of the owner'"'"'s account number hidden beneath an opaque shield. The card has a keyboard and microprocessing components electrically connected to the shield. Insertion of correct entries, e.g. an owner'"'"'s personal identification number, into the keyboard results in application of an electric signal to the shield to render it transparent in order that the code may be viewed by another person or by a machine. Erroneous attempts to operate the keyboard beyond a predetermined standard disable the keyboard from further operation.
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Citations
17 Claims
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1. A portable identification device having a code display means and a processing system mounted unitarily, said processing system having identification input means,
masking means over said code display means, said masking means in a first mode preventing visual reading of said code display means, and in a second mode permitting visual reading of said code display means, said processing system having means to cause said masking means to switch from said first mode to said second mode.
Specification