TREA

Yasuo Hirasawa

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  • Tokyo, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Lighting lamp
    • Patent number 4,991,074
    • Issue date Feb 5, 1991
    • Tomoegawa Paper Co., Ltd.
    • Yasuo Kobayashi
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Circular fluorescent lamp with oval section of tube
    • Patent number 4,961,024
    • Issue date Oct 2, 1990
    • Hitachi, Ltd.
    • Churyo Kodama
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Lighting lamp
    • Patent number 4,954,937
    • Issue date Sep 4, 1990
    • Tomoegawa Paper Co., Ltd.
    • Yasuo Kobayashi
    • H01 - BASIC ELECTRIC ELEMENTS