TREA

Yasuo Gan

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  • Saitama, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Loudspeaker
    • Patent number 5,115,883
    • Issue date May 26, 1992
    • Pioneer Electronic Corporation
    • Hideaki Morikawa
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Speaker system having directivity
    • Patent number 5,117,463
    • Issue date May 26, 1992
    • Pioneer Electronic Corporation
    • Takashi Oyaba
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Speaker system having directivity
    • Patent number 4,991,687
    • Issue date Feb 12, 1991
    • Pioneer Electronic Corporation
    • Takashi Oyaba
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE