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Parametric optical detector
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Patent number 4,218,776
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Issue date Aug 19, 1980
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Bell Telephone Laboratories, Incorporated
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Harold Seidel
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Balancing impedance circuit
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Patent number 4,181,824
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Issue date Jan 1, 1980
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Bell Telephone Laboratories, Incorporated
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Harold Seidel
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Electronic hybrid
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Patent number 4,174,470
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Issue date Nov 13, 1979
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Bell Telephone Laboratories, Incorporated
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Harold Seidel
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Arc-cosine phase modulators
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Patent number 4,095,196
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Issue date Jun 13, 1978
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Bell Telephone Laboratories, Incorporated
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Harold Seidel
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H03 - BASIC ELECTRONIC CIRCUITRY
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Interferometric amplifier
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Patent number 4,090,147
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Issue date May 16, 1978
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Bell Telephone Laboratories, Incorporated
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Harold Seidel
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H03 - BASIC ELECTRONIC CIRCUITRY
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Capacitance magnification circuit
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Patent number 4,025,867
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Issue date May 24, 1977
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Bell Telephone Laboratories, Incorporated
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Harold Seidel
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G06 - COMPUTING CALCULATING COUNTING
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Integrated solid state isolator circuit
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Patent number 4,024,452
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Issue date May 17, 1977
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Bell Telephone Laboratories, Incorporated
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Harold Seidel
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Frequency sample-and-hold circuit
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Patent number 3,962,541
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Issue date Jun 8, 1976
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Bell Telephone Laboratories, Incorporated
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Harold Seidel
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H04 - ELECTRIC COMMUNICATION TECHNIQUE