TREA

Ogawa Chemical Industries, Ltd.

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  • Tokyo, JP
Organizations

Patents Grantslast 30 patents

  • Information Patent Grant

    Mechanical marking pen
    • Patent number 4,969,765
    • Issue date Nov 13, 1990
    • Ogawa Chemical Industries Ltd.
    • Masahiko Nagai
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Detachable head member having slit structure
    • Patent number 4,408,921
    • Issue date Oct 11, 1983
    • Ogawa Chemical Industries, Ltd.
    • Masahiko Nagai
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Nib holder construction for writing implements
    • Patent number 4,357,117
    • Issue date Nov 2, 1982
    • Ogawa Chemical Industries, Ltd.
    • Masahiko Nagai
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES