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Mechanical pencil
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Patent number 9,302,529
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Issue date Apr 5, 2016
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Mitsubishi Pencil Co., Ltd.
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Hirotake Izawa
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Optical connector
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Patent number 9,195,016
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Issue date Nov 24, 2015
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Mitsubishi Pencil Company, Limited
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Hitoshi Suzuki
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G02 - OPTICS
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Mechanical pencil
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Patent number 8,337,107
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Issue date Dec 25, 2012
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Mitsubishi Pencil Co., Ltd.
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Norio Ohsawa
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Mechanical pencil
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Patent number 7,850,380
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Issue date Dec 14, 2010
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Mitsubishi Pencil Co., Ltd.
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Hirotake Izawa
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Mechanical pencil
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Patent number 7,850,381
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Issue date Dec 14, 2010
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Mitsubishi Pencil Co., Ltd.
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Hirotake Izawa
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Mechanical pencil
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Patent number 7,806,615
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Issue date Oct 5, 2010
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Mitsubishi Pencil Co., Ltd.
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Hirotake Izawa
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Mechanical pencil
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Patent number 7,802,936
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Issue date Sep 28, 2010
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Mitsubishi Pencil Co., Ltd.
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Hirotake Izawa
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Writing implement
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Patent number 7,140,799
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Issue date Nov 28, 2006
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Mitsubishi Pencil Kabushikikaisha
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Takeshi Kobayashi
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Writing implement
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Patent number 7,070,352
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Issue date Jul 4, 2006
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Mitsubishi Pencil Kabushikikaisha
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Hisashi Iida
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Ink reservoir for writing instrument
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Patent number 7,056,052
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Issue date Jun 6, 2006
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Mitsubishi Pencil Co., Ltd.
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Shuji Ichikawa
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Writing implement
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Patent number 6,582,144
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Issue date Jun 24, 2003
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Mitsubishi Pencil Kabushikikaisha
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Kazuaki Matsumoto
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Sphere polishing machine
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Patent number 5,913,717
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Issue date Jun 22, 1999
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NSK Ltd.
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Katsuhisa Tonooka
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B24 - GRINDING POLISHING
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