Patents by Inventor Kayo Hashiguchi

Kayo Hashiguchi 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).

  • Highly weather-resistant magnet powder and magnet produced by using the same
    Patent number: 6926963
    Abstract: The objects of the present invention are to provide a highly weather-resistant iron-based magnet powder containing a rare-earth element, characterized by high coercive force in a practically important humid atmosphere, resin composition containing the same powder for bonded magnets, and bonded and compacted magnets containing the same powder. The present invention provides the above-described products by optimizing the functions and types of the phosphate coating film, uniformly formed over the surfaces of the iron-based magnet powder particles containing a rare-earth element.
    Type: Grant
    Filed: September 27, 2001
    Date of Patent: August 9, 2005
    Assignee: Sumitomo Metal Mining Co., Ltd.
    Inventors: Kenji Ohmori, Toshiyuki Osako, Kayo Hashiguchi, Kouichi Yokosawa
  • Method of producing highly weather-resistant magnet powder, and product produced by the same method
    Patent number: 6638367
    Abstract: The objects of the present invention are to provide a method of producing highly weather-resistant iron-based magnet powder containing a rare-earth element, particularly characterized by high coercive force in a practically important humid atmosphere, highly weather-resistant magnet powder produced by the same method, resin composition containing the same powder for bonded magnets, and bonded magnet containing the same powder. The present invention provides a method of producing a magnet powder by crushing an iron-based magnet powder containing a rare-earth element in an organic solvent, wherein phosphoric acid is added to the solvent in which the powder is crushed.
    Type: Grant
    Filed: September 19, 2001
    Date of Patent: October 28, 2003
    Assignee: Sumitomo Metal Mining Co., Ltd.
    Inventors: Kenji Ohmori, Toshiyuki Osako, Kayo Hashiguchi, Kouichi Yokosawa
  • Highly weather-resistant magnet powder and magnet produced by using the same
    Publication number: 20020084440
    Abstract: The objects of the present invention are to provide a highly weather-resistant iron-based magnet powder containing a rare-earth element, characterized by high coercive force in a practically important humid atmosphere, resin composition containing the same powder for bonded magnets, and bonded and compacted magnets containing the same powder. The present invention provides the above-described products by optimizing the functions and types of the phosphate coating film, uniformly formed over the surfaces of the iron-based magnet powder particles containing a rare-earth element.
    Type: Application
    Filed: September 27, 2001
    Publication date: July 4, 2002
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Kenji Ohmori, Toshiyuki Osako, Kayo Hashiguchi, Kouichi Yokosawa
  • Method of producing highly weather-resistant magnet powder, and product produced by the same method
    Publication number: 20020066499
    Abstract: The objects of the present invention are to provide a method of producing highly weather-resistant iron-based magnet powder containing a rare-earth element, particularly characterized by high coercive force in a practically important humid atmosphere, highly weather-resistant magnet powder produced by the same method, resin composition containing the same powder for bonded magnets, and bonded magnet containing the same powder. The present invention provides a method of producing a magnet powder by crushing an iron-based magnet powder containing a rare-earth element in an organic solvent, wherein phosphoric acid is added to the solvent in which the powder is crushed.
    Type: Application
    Filed: September 19, 2001
    Publication date: June 6, 2002
    Applicant: Sumitomo Metal Mining Co., Ltd.
    Inventors: Kenji Ohmori, Toshiyuki Osako, Kayo Hashiguchi, Kouichi Yokosawa