TREA

Takao Koyama

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Patents Grantslast 30 patents

  • Information Patent Grant

    Writing instrument
    • Patent number 8,684,617
    • Issue date Apr 1, 2014
    • Mitsubishi Pencil Kabushiki Kaisha
    • Takao Koyama
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Refill for correction pen and refill unit
    • Patent number 7,600,938
    • Issue date Oct 13, 2009
    • Mitsubishi Pencil Co., Ltd.
    • Kyoko Kobayashi
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Liquid for electrophoretic display, display medium and display devi...
    • Patent number 7,405,865
    • Issue date Jul 29, 2008
    • Mitsubishi Pencil Co., Ltd.
    • Yasuaki Ogiwara
    • G02 - OPTICS
  • Information Patent Grant

    Ink-storing body for writing utensil
    • Patent number 7,063,475
    • Issue date Jun 20, 2006
    • Mitsubishi Pencil Kabushiki Kaisha
    • Kazuhisa Kirita
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Free-ink type writing instrument
    • Patent number 6,517,273
    • Issue date Feb 11, 2003
    • Mitsubishi Pencil Kabushiki Kaisha
    • Takao Koyama
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Free-ink type writing instrument
    • Patent number 6,443,649
    • Issue date Sep 3, 2002
    • Mitsubishi Pencil Kabushiki Kaisha
    • Takao Koyama
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Writing instrument
    • Patent number 6,409,408
    • Issue date Jun 25, 2002
    • Mitsubishi Pencil Kabushiki Kaisha
    • Takao Koyama
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Ball point pen filled with erasable ink
    • Patent number 5,977,211
    • Issue date Nov 2, 1999
    • Mitsubishi Pencil Kabushiki Kaisha
    • Takao Koyama
    • C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
  • Information Patent Grant

    Writing instrument
    • Patent number 5,944,438
    • Issue date Aug 31, 1999
    • Mitsubishi Pencil Kabushiki Kaisha
    • Takao Koyama
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Non-erasable pencil lead
    • Patent number 5,716,434
    • Issue date Feb 10, 1998
    • Mitsubishi Pencil Kabushiki Kaisha
    • Takao Koyama
    • C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
  • Information Patent Grant

    Process for coating carbonized material with metal
    • Patent number 5,178,908
    • Issue date Jan 12, 1993
    • Mitsubishi Pencil Co., Ltd.
    • Takao Koyama
    • C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
  • Information Patent Grant

    Process for producing carbon heat generator
    • Patent number 4,863,649
    • Issue date Sep 5, 1989
    • Mitsubishi Pencil Co., Ltd.
    • Takamasa Kawakubo
    • C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES

Patents Applicationslast 30 patents

  • Information Patent Application

    GLASSY CARBON COMPACT
    • Publication number 20220356062
    • Publication date Nov 10, 2022
    • MITSUBISHI PENCIL COMPANY, LIMITED
    • Kunitaka YAMADA
    • C01 - INORGANIC CHEMISTRY
  • Information Patent Application

    WRITING INSTRUMENT
    • Publication number 20100074672
    • Publication date Mar 25, 2010
    • Mitsubishi Pencil Kabushiki Kaisha
    • Takao Koyama
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Application

    Liquid for electrophoretic display and display medium and display e...
    • Publication number 20070002427
    • Publication date Jan 4, 2007
    • Yasuaki Ogiwara
    • G02 - OPTICS
  • Information Patent Application

    Refill for correction pen and refill unit
    • Publication number 20060075924
    • Publication date Apr 13, 2006
    • Kyoko Kobayashi
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Application

    Writing utensil
    • Publication number 20050232685
    • Publication date Oct 20, 2005
    • Mitsubishi Pencil Kabushiki Kaisha
    • Takao Koyama
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Application

    Ink-storing body for writing utensil
    • Publication number 20040228673
    • Publication date Nov 18, 2004
    • Kazuhisa Kirita
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Application

    FREE-INK TYPE WRITING INSTRUMENT
    • Publication number 20020131808
    • Publication date Sep 19, 2002
    • Takao Koyama
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Application

    Free-ink type writing instrument
    • Publication number 20020081142
    • Publication date Jun 27, 2002
    • Takao Koyama
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Application

    Writing instrument
    • Publication number 20010016142
    • Publication date Aug 23, 2001
    • Mitsubishi Pencil Kabushiki Kaisha
    • Takao Koyama
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES