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System protection switching
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Issue date Jan 30, 2001
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Nortel Networks Limited
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Liqian Yao
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Method for reducing group delay distortion
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Patent number 4,630,285
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Issue date Dec 16, 1986
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The United States of America as represented by the Director of the National S...
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James W. Dyer
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3846588
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Patent number 3,846,588
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Issue date Nov 5, 1974
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3676684
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Patent number 3,676,684
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Issue date Jul 11, 1972
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3632891
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Patent number 3,632,891
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Issue date Jan 4, 1972
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3609693
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Patent number 3,609,693
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Issue date Sep 28, 1971
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3603744
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Patent number 3,603,744
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Issue date Sep 7, 1971
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3588700
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Patent number 3,588,700
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Issue date Jun 28, 1971
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3566049
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Patent number 3,566,049
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Issue date Feb 23, 1971
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3566046
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Patent number 3,566,046
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Issue date Feb 23, 1971
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3548120
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Patent number 3,548,120
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Issue date Dec 15, 1970
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3450841
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Patent number 3,450,841
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Issue date Jun 17, 1969
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H04 - ELECTRIC COMMUNICATION TECHNIQUE