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Circuit-switched switching system
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Patent number 7,920,571
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Issue date Apr 5, 2011
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AT&T Intellectual Property II, L.P.
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Richard Robert Shively
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Binary tree multiprocessor
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Patent number 4,910,669
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Issue date Mar 20, 1990
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AT&T Bell Laboratories
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Allen L. Gorin
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G06 - COMPUTING CALCULATING COUNTING
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Digital phase shifter
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Patent number 3,997,772
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Issue date Dec 14, 1976
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Bell Telephone Laboratories, Incorporated
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Ronald Eldon Crochiere
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H04 - ELECTRIC COMMUNICATION TECHNIQUE