Patents by Inventor Tadamichi Kawakubo

Tadamichi Kawakubo 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).

  • Permanent magnet for particle beam accelerator and magnetic field generator
    Patent number: 7570142
    Abstract: A permanent magnet for a particle accelerator and a magnetic field generator, in which Nd—Fe—B based magnets are used but are not demagnetized so easily even when exposed to a radiation, are provided. A permanent magnet for a particle accelerator is used in an environment in which the magnet is exposed to a radiation at an absorbed dose of at least 3,000 Gy. The magnet includes R (which is at least one of the rare-earth elements), B, TM (which is at least one transition element and includes Fe) and inevitably contained impurity elements. The magnet is a sintered magnet that has been magnetized to a permeance coefficient of 0.5 or more and that has a coercivity HcJ of 1.6 MA/m or more.
    Type: Grant
    Filed: February 20, 2004
    Date of Patent: August 4, 2009
    Assignee: Hitachi Metals, Ltd.
    Inventors: Ken Makita, Eiji Sugiyama, Masaaki Aoiki, Kaichi Murakami, Tadamichi Kawakubo, Eiji Nakamura
  • Permanent magnet for particle beam accelerator and magnetic field generator
    Publication number: 20050258784
    Abstract: A permanent magnet for a particle accelerator and a magnetic field generator, in which Nd—Fe—B based magnets are used but are not demagnetized so easily even when exposed to a radiation, are provided. A permanent magnet for a particle accelerator is used in an environment in which the magnet is exposed to a radiation at an absorbed dose of at least 3,000 Gy. The magnet includes R (which is at least one of the rare-earth elements), B, TM (which is at least one transition element and includes Fe) and inevitably contained impurity elements. The magnet is a sintered magnet that has been magnetized to a permeance coefficient of 0.5 or more and that has a coercivity HcJ of 1.6 MA/m or more.
    Type: Application
    Filed: February 20, 2004
    Publication date: November 24, 2005
    Applicants: Neomax Co., LTD., Inter-University Research Institute Corporation High Energy Accelerator Research Organization
    Inventors: Ken Makita, Eiji Sugiyama, Masaaki Aoki, Kaichi Murakami, Tadamichi Kawakubo, Eiji Nakamura