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Secure communication system
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Patent number 5,963,621
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Issue date Oct 5, 1999
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Comsat Corporation
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Secure communication system
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Patent number 5,724,414
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Issue date Mar 3, 1998
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Comsat Corporation
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Bidirectional trellis coding
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Patent number 5,594,742
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Issue date Jan 14, 1997
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Communications Satellite Corporation
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Farhad Hemmati
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H03 - BASIC ELECTRONIC CIRCUITRY
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Secure communication system
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Patent number 5,404,394
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Issue date Apr 4, 1995
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Comsat Corporation
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Spiros Dimolitsas
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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