Patents by Inventor Mitsutoshi Akiyama

Mitsutoshi Akiyama 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).

  • Method for producing dust core
    Patent number: 8241557
    Abstract: An object of the present invention is to provide a method for producing a dust core wherein generation of iron oxide at grain boundaries in the dust core is unlikely to take place upon annealing of the dust core subjected to compaction, thus allowing excellent electromagnetic characteristics to be realized. Also, the following is provided: a method for producing a dust core, which comprises: a step of molding a magnetic powder comprising a powder for a dust core formed with an iron-based magnetic powder coated with a silicone resin into a dust core via compaction; and a step of annealing the dust core via heating so as to cause the silicone resin contained in the dust core to be partially formed into a silicate compound, wherein annealing of the dust core is carried out at a dew point of an inert gas of ?40° C. or lower in an inert gas atmosphere in the annealing step.
    Type: Grant
    Filed: July 22, 2011
    Date of Patent: August 14, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masaki Sugiyama, Toshiya Yamaguchi, Shinjiro Saigusa, Mitsutoshi Akiyama
  • METHOD FOR PRODUCING DUST CORE
    Publication number: 20110274576
    Abstract: An object of the present invention is to provide a method for producing a dust core wherein generation of iron oxide at grain boundaries in the dust core is unlikely to take place upon annealing of the dust core subjected to compaction, thus allowing excellent electromagnetic characteristics to be realized. Also, the following is provided: a method for producing a dust core, which comprises: a step of molding a magnetic powder comprising a powder for a dust core formed with an iron-based magnetic powder coated with a silicone resin into a dust core via compaction; and a step of annealing the dust core via heating so as to cause the silicone resin contained in the dust core to be partially formed into a silicate compound, wherein annealing of the dust core is carried out at a dew point of an inert gas of ?40° C. or lower in an inert gas atmosphere in the annealing step.
    Type: Application
    Filed: July 22, 2011
    Publication date: November 10, 2011
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masaki SUGIYAMA, Toshiya YAMAGUCHI, Shinjiro SAIGUSA, Mitsutoshi AKIYAMA