The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 08, 2013
Filed:
Apr. 22, 2010
Satoru Banzai, Fujioka, JP;
Katsunori Kitazawa, Fujioka, JP;
Satoru Banzai, Fujioka, JP;
Katsunori Kitazawa, Fujioka, JP;
Mitsubishi Pencil Company, Limited, Shinagawa-Ku, Tokyo, JP;
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 m/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.