05478994 is referenced by 211 patents and cites 10 patents.

A secure credit card 10 has a body member to which is attached a microprocessor controller 14 electrically coupled a Programmable Read Only Memory (PROM) device 18 programmed with a series of random numbers in a predetermined sequence. The random numbers are identical to random numbers in a host computer and in the identical sequence as the random numbers in the host computer. This computer is accessible upon each use of the credit card 10. The Programmable Read Only Memory (PROM) accesses the next random number in sequence with each use of the credit card 10 to permit verification by comparing the random number with each use of the credit card 10 with the next random number in sequence as indicated by the computer. A switch 20 actuated with each use of the credit card 10 provides a pulse signal that activates the microprocessor controller 14 to turn on the Programmable Read Only Memory (PROM) to access the next random number in the sequence. A counter 26 connected to the microprocessor controller 14 counts the number of pulse signals received to count each use of the credit card 10. A display device 24 displays the next Personal Identification Number (PIN) in the sequence each time a pulse is received.

Title
Secure credit card which prevents unauthorized transactions
Application Number
8/274252
Publication Number
5478994
Application Date
July 13, 1994
Publication Date
December 26, 1995
Inventor
Grant Parker
3996 Myra Ave., Los Alamitos, 90720
CA, US
Adarsh Pun
5404 White Fox Dr., Rancho Palos Verdes, 90274
CA, US
John Brown
12831 Longden St., Garden Grove, 92645
CA, US
Jim Magner
5092 Tripoli Ave., Los Alamitos, 90720
CA, US
Sam Rahman
4809 Laurette St., Torrance, 90503
CA, US
Agent
John J Connors & Associates Connors
IPC
G06K 5/00
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