Patents by Inventor Iwao Yanagizawa

Iwao Yanagizawa 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).

  • Carbon brush of motor and method for producing the same
    Patent number: 8004143
    Abstract: An electric motor that includes a rotor; a coil that is wound around the rotor; and a carbon brush that supplies power to the coil, wherein the brush is formed by using a raw material in which artificial graphite whose crystallites are flaky in shape is mixed with natural graphite whose crystallites are squamous or scaly in shape.
    Type: Grant
    Filed: November 6, 2006
    Date of Patent: August 23, 2011
    Assignees: Mitsuba Corporation, Kunimitsu Carbon Industrial Co., Ltd.
    Inventor: Iwao Yanagizawa
  • Carbon Brush of Motor and Method for Producing the Same
    Publication number: 20090230814
    Abstract: An electric motor that includes a rotor; a coil that is wound around the rotor; and a carbon brush that supplies power to the coil, wherein the brush is formed by using a raw material in which artificial graphite whose crystallites are flaky in shape is mixed with natural graphite whose crystallites are squamous or scaly in shape.
    Type: Application
    Filed: November 6, 2006
    Publication date: September 17, 2009
    Applicants: MITSUBA CORPORATION, KUNIMITSU CARBON INDUSTRIAL CO., LTD.
    Inventor: Iwao Yanagizawa
  • Commutator with improved connection between carbon and metal segments
    Patent number: 5552652
    Abstract: A flat commutator includes a circular arrangement of sectorial carbon segments made of conductive carbon providing commutating surface of the commutator, metallic segments attached to respective of the carbon segments, and a hub body of synthetic resin. The metallic segments have fixing members encroaching into inner and outer peripheral surfaces of the carbon segments, thereby fixing the carbon segments to the metallic segments. The hub body encloses at least fixed portions of the inner and outer peripheral surfaces of the carbon segments that engage with the fixing members of the metallic segments.
    Type: Grant
    Filed: December 1, 1994
    Date of Patent: September 3, 1996
    Assignees: Mitsuba Electric Mfg. Co., Ltd., Kunimitsu Carbon Industry Co., Ltd.
    Inventors: Shuji Shimoyama, Iwao Yanagizawa