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Kohei Ishizuka

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Patents Grantslast 30 patents

  • Information Patent Grant

    Light transmission module
    • Patent number 5,479,288
    • Issue date Dec 26, 1995
    • Hitachi, Ltd.
    • Kohei Ishizuka
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Electric power detecting circuit and gain control circuit using the...
    • Patent number 4,531,089
    • Issue date Jul 23, 1985
    • Hitachi, Ltd.
    • Kohei Ishizuka
    • G01 - MEASURING TESTING
  • Information Patent Grant

    Automatic equalizer apparatus
    • Patent number 4,477,913
    • Issue date Oct 16, 1984
    • Hitachi, Ltd.
    • Masahiro Koya
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Gain control circuit
    • Patent number 4,292,596
    • Issue date Sep 29, 1981
    • Hitachi, Ltd.
    • Kohei Ishizuka
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    Variable equalizer
    • Patent number 4,204,176
    • Issue date May 20, 1980
    • Hitachi, Ltd.
    • Yoshitaka Takasaki
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Variable equalizer
    • Patent number 4,187,479
    • Issue date Feb 5, 1980
    • Hitachi, Ltd.
    • Kohei Ishizuka
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Variable equalizer
    • Patent number 4,122,417
    • Issue date Oct 24, 1978
    • Hitachi, Ltd.
    • Yoshitaka Takasaki
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Variable equalizer
    • Patent number 4,101,851
    • Issue date Jul 18, 1978
    • Hitachi, Ltd.
    • Kohei Ishizuka
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE