TREA

Tsutomu Yoshioka

Follow

Person

  • Hyogo, JP
People

Patents Grantslast 30 patents

  • Information Patent Grant

    Speaker system
    • Patent number 8,189,823
    • Issue date May 29, 2012
    • TOA Corporation
    • Seiichi Tezuka
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Horn loudspeaker
    • Patent number 6,658,128
    • Issue date Dec 2, 2003
    • TOA Corporation
    • Tsutomu Yoshioka
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Throat device interconnecting a plurality of drive units and a horn
    • Patent number 5,715,322
    • Issue date Feb 3, 1998
    • TOA Corporation
    • Tsutomu Yoshioka
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Loudspeaker horn
    • Patent number 5,285,025
    • Issue date Feb 8, 1994
    • Toa Corporation
    • Tsutomu Yoshioka
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS

Patents Applicationslast 30 patents

  • Information Patent Application

    SPEAKER SYSTEM
    • Publication number 20100027827
    • Publication date Feb 4, 2010
    • TOA CORPORATION
    • Seiichi Tezuka
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE