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Ritsuo Koga

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  • Tokyo, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Magnetic erasing device
    • Patent number 11,769,429
    • Issue date Sep 26, 2023
    • Zero Lab Co., Ltd.
    • Ritsuo Koga
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Magnetic eraser, writing system and display device
    • Patent number 11,335,487
    • Issue date May 17, 2022
    • Zero Lab Co., Ltd.
    • Ritsuo Koga
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Magnetic erasing device
    • Patent number 10,997,880
    • Issue date May 4, 2021
    • Zero Lab Co., Ltd.
    • Ritsuo Koga
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Magnetic pen
    • Patent number 10,442,236
    • Issue date Oct 15, 2019
    • Zero Lab Co., Ltd.
    • Ritsuo Koga
    • G02 - OPTICS
  • Information Patent Grant

    Magnetic pen
    • Patent number 10,046,592
    • Issue date Aug 14, 2018
    • Zero Lab Co., Ltd.
    • Ritsuo Koga
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Lamp cartridge
    • Patent number 6,340,237
    • Issue date Jan 22, 2002
    • Plus Corporation
    • Ritsuo Koga
    • F21 - LIGHTING
  • Information Patent Grant

    Image display apparatus
    • Patent number 6,129,437
    • Issue date Oct 10, 2000
    • Plus Corporation
    • Ritsuo Koga
    • G02 - OPTICS
  • Information Patent Grant

    Automatic manuscript sheet feeder
    • Patent number 5,803,449
    • Issue date Sep 8, 1998
    • Plus Corporation
    • Ritsuo Koga
    • B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
  • Information Patent Grant

    Opaque projector
    • Patent number 4,979,813
    • Issue date Dec 25, 1990
    • Plus Corporation
    • Ritsuo Koga
    • G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
  • Information Patent Grant

    Portable transfer apparatus
    • Patent number 4,802,014
    • Issue date Jan 31, 1989
    • Plus Corporation
    • Ritsuo Koga
    • B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS

Patents Applicationslast 30 patents

  • Information Patent Application

    Magnetic Sheet, Magnetic Writing System, Drawing Method, and Erasin...
    • Publication number 20240053833
    • Publication date Feb 15, 2024
    • Zero Lab Co., Ltd.
    • Ritsuo Koga
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Application

    MAGNETIC ERASER, WRITING SYSTEM AND DISPLAY DEVICE
    • Publication number 20210313105
    • Publication date Oct 7, 2021
    • Zero Lab Co., Ltd.
    • Ritsuo Koga
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Application

    MAGNETIC ERASING DEVICE
    • Publication number 20210217332
    • Publication date Jul 15, 2021
    • Zero Lab Co., Ltd.
    • Ritsuo Koga
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Application

    Magnetic Pen
    • Publication number 20180319201
    • Publication date Nov 8, 2018
    • Zero Lab Co., Ltd.
    • Ritsuo Koga
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Application

    Magnetic Erasing Device
    • Publication number 20180053452
    • Publication date Feb 22, 2018
    • Zero Lab Co., Ltd.
    • Ritsuo Koga
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Application

    Magnetic Pen
    • Publication number 20180029404
    • Publication date Feb 1, 2018
    • Zero Lab Co., Ltd.
    • Ritsuo Koga
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES