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Katsumi Otsuka

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  • Funabashi, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Pen tip structure
    • Patent number 4,842,433
    • Issue date Jun 27, 1989
    • Teibow Co., Ltd.
    • Katsumi Otsuka
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Pen tip structure
    • Patent number 4,795,286
    • Issue date Jan 3, 1989
    • Teibow Co., Ltd.
    • Tetsuo Shimoishi
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Apparatus and method for producing a continuous nib rod for a writi...
    • Patent number 4,362,683
    • Issue date Dec 7, 1982
    • Teibow Company Limited
    • Katsumi Otsuka
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES