Invention Grant
- Patent Title: Pencil lead and production process for the same
- Patent Title (中): 铅笔铅和生产过程相同
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Application No.: US13265476Application Date: 2010-04-22
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Publication No.: US08349063B2Publication Date: 2013-01-08
- Inventor: Satoru Banzai , Katsunori Kitazawa
- Applicant: Satoru Banzai , Katsunori Kitazawa
- Applicant Address: JP Shinagawa-Ku, Tokyo
- Assignee: Mitsubishi Pencil Company, Limited
- Current Assignee: Mitsubishi Pencil Company, Limited
- Current Assignee Address: JP Shinagawa-Ku, Tokyo
- Agency: Buchanan Ingersoll & Rooney PC
- Priority: JP2009-106112 20090424; JP2009-106113 20090424; JP2009-106114 20090424; JP2009-106115 20090424; JP2009-106116 20090424; JP2009-106117 20090424; JP2010-051954 20100309; JP2010-051955 20100309; JP2010-051956 20100309; JP2010-051957 20100309; JP2010-051958 20100309; JP2010-051959 20100309
- International Application: PCT/JP2010/057159 WO 20100422
- International Announcement: WO2010/123070 WO 20101028
- Main IPC: C09D13/00
- IPC: C09D13/00

Abstract:
A pencil lead containing flake graphite which has an ab face having a flatness of at least 2 μm or less and in which an aspect ratio of an a axis or a b axis in the ab face to a c axis is 5 or more is provided with a structure in which nanoparticles having a mv value of 0.05 to 2 based on 100 of a volume average diameter (mv value) of the graphite and having a sphericity of 0.1 to 20 nm or nanoparticles having a mv value of 0.05 to 2 based on 100 of a volume average diameter (mv value) of the graphite and having a specific surface area of 200 to 600 m2/g are brought into contact with the ab face of the graphite or a structure in which they are adhered to the ab face of the graphite.
Public/Granted literature
- US20120037035A1 PENCIL LEAD AND PRODUCTION PROCESS FOR THE SAME Public/Granted day:2012-02-16
Information query
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