Patents by Inventor Masayuki Takuma

Masayuki Takuma has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Metal coated carbon brush
    Patent number: 7129615
    Abstract: Disclosed is a metal coated carbon brush having a carbonaceous substrate and a metal coating formed on a surface of the carbonaceous substrate having a mean pore radius of 0.1–2.0 ?m and an accumulative pore volume of 50–600 mm3/g.
    Type: Grant
    Filed: April 6, 2004
    Date of Patent: October 31, 2006
    Assignee: Totankako Co., Ltd.
    Inventors: Miyozi Arai, Kazuhiro Takahashi, Masayuki Takuma, Takahiro Sakoda
  • Carbon brush for electric machine
    Patent number: 6909219
    Abstract: Molybdenum disulfide, tungsten disulfide or the like as a solid lubricant and any of alumina, silica, silicon carbide or the like as an abrasive are added to filter graphite. A metal of good electric conductor is coated over the whole surface of a carbon brush material except a part of the carbon brush material to be contacted with a commutator. When the commutator rotates clockwise, a metal coating of the good electric conductor is removed mechanically from at least a part of at least either of a left side surface or a right side surface.
    Type: Grant
    Filed: June 15, 2001
    Date of Patent: June 21, 2005
    Assignee: Totankako Co., Ltd.
    Inventors: Kazuhiro Takahashi, Masayuki Takuma, Koji Kuroda
  • Metal coated carbon brush
    Publication number: 20040212272
    Abstract: Disclosed is a metal coated carbon brush having a carbonaceous substrate and a metal coating formed on a surface of the carbonaceous substrate having a mean pore radius of 0.1-2.0 &mgr;m and an accumulative pore volume of 50-600 mm3/g.
    Type: Application
    Filed: April 6, 2004
    Publication date: October 28, 2004
    Applicant: TOTANKAKO CO., LTD.
    Inventors: Miyozi Arai, Kazuhiro Takahashi, Masayuki Takuma, Takahiro Sakoda
  • Carbon brush for electric machine
    Publication number: 20030155837
    Abstract: A metal of good electric conductor is coated over the whole surface of the carbon brush material comprising molybdenum disulfide, tungsten disulfide or the like as a solid lubricant and any of alumina, silica, silicon carbide or the like, except a part of the carbon brush material to be contacted with a commutator. At least a part of at least either of side surfaces of the carbon brush orthogonal to a rotation direction of the commutator is formed as an area in which a metal coating of good electric conductor is not formed and from which the carbon brush material is exposed.
    Type: Application
    Filed: April 7, 2003
    Publication date: August 21, 2003
    Inventors: Kazuhiro Takahashi, Masayuki Takuma, Koji Kuroda