TREA

Masao Sumi

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  • Higashi-yamato, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Optical fiber
    • Patent number 4,206,967
    • Issue date Jun 10, 1980
    • Hitachi, Ltd.
    • Seiichi Onoda
    • G02 - OPTICS
  • Information Patent Grant

    Optical transmission line
    • Patent number 4,185,890
    • Issue date Jan 29, 1980
    • Hitachi Ltd.
    • Seiichi Onoda
    • G02 - OPTICS
  • Information Patent Grant

    Optical fiber
    • Patent number 4,184,744
    • Issue date Jan 22, 1980
    • Hitachi, Ltd.
    • Seiichi Onoda
    • G02 - OPTICS
  • Information Patent Grant

    Apparatus for producing optical fiber
    • Patent number 4,123,242
    • Issue date Oct 31, 1978
    • Hitachi, Ltd.
    • Katsuyuki Imoto
    • G05 - CONTROLLING REGULATING
  • Information Patent Grant

    Method and apparatus for drawing optical fiber
    • Patent number 4,101,300
    • Issue date Jul 18, 1978
    • Hitachi, Ltd.
    • Katsuyuki Imoto
    • C03 - GLASS MINERAL OR SLAG WOOL