TREA

Hiroyuki Sogawa

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  • Kitashinagawa, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Audio signal reproducing apparatus
    • Patent number 5,495,534
    • Issue date Feb 27, 1996
    • Sony Corporation
    • Kiyofumi Inanaga
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Acoustic signal reproducing apparatus
    • Patent number 5,452,359
    • Issue date Sep 19, 1995
    • Sony Corporation
    • Kiyofumi Inanaga
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Earphone device
    • Patent number 5,276,740
    • Issue date Jan 4, 1994
    • Sony Corporation
    • Kiyofumi Inanaga
    • A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
  • Information Patent Grant

    Hearing aid
    • Patent number 5,228,089
    • Issue date Jul 13, 1993
    • Sony Corporation
    • Kiyofumi Inanaga
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Acoustic signal reproducing apparatus
    • Patent number 5,181,248
    • Issue date Jan 19, 1993
    • Sony Corporation
    • Kiyofumi Inanaga
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Induction speaker
    • Patent number 5,062,140
    • Issue date Oct 29, 1991
    • Sony Corporation
    • Kiyofumi Inanaga
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Sound reproducing apparatus
    • Patent number 5,022,486
    • Issue date Jun 11, 1991
    • Sony Corporation
    • Masayoshi Miura
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS
  • Information Patent Grant

    Diaphragm
    • Patent number 4,726,443
    • Issue date Feb 23, 1988
    • Sony Corporation and Fujikura Ltd.
    • Masana Ugaji
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE