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Transaction approval system
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Patent number 4,908,521
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Issue date Mar 13, 1990
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Visa International Service Association
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Elvis W. Boggan
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G06 - COMPUTING CALCULATING COUNTING
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Transaction approval system
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Patent number 4,870,259
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Issue date Sep 26, 1989
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Visa International Service Association
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Elvis W. Boggan
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G06 - COMPUTING CALCULATING COUNTING
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Transaction approval system
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Patent number 4,822,985
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Issue date Apr 18, 1989
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Visa International Service Association
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Elvis W. Boggan
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G06 - COMPUTING CALCULATING COUNTING
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Authenticator code generator
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Patent number 4,304,961
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Issue date Dec 8, 1981
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Burroughs Corporation
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Carl M. Campbell
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G06 - COMPUTING CALCULATING COUNTING
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Link encryption device
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Patent number 4,160,120
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Issue date Jul 3, 1979
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Burroughs Corporation
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Vera L. Barnes
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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