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Balanced hybrid circuit
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Patent number 5,822,426
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Issue date Oct 13, 1998
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International Business Machines Corporation
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Todd Morgan Rasmus
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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ISDN power source detection circuit
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Patent number 5,307,406
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Issue date Apr 26, 1994
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International Business Machines Corporation
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Timothy W. Gee
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Dual fiber drive system
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Patent number 5,224,111
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Issue date Jun 29, 1993
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International Business Machines Corporation
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George R. Stilwell
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Multi-data rate selectable equalizer
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Patent number 5,048,055
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Issue date Sep 10, 1991
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International Business Machines Corporation
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John L. Creigh
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H04 - ELECTRIC COMMUNICATION TECHNIQUE