Patents by Inventor Syunsuke Kurasawa

Syunsuke Kurasawa 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).

  • Ferrite magnetic material and process for producing the same
    Patent number: 7425280
    Abstract: The present invention provides a ferrite magnet material comprising, as a main phase, a ferrite having a hexagonal structure, the main phase containing A, La, R, Fe and Co, wherein A is at least one element selected from Sr, Ba and Pb, R is Pr and/or Nd, and the proportions of the total metal elements A, La, R, Fe and Co in the main phase are respectively A: 1 to 13 atomic %, La: 0.003 to 10 atomic %, R: 0 to 10 atomic % (excluding 0) Fe: 80 to 95 atomic % and Co: 0.05 to 5 atomic % based on the total amounts of metal elements. The residual magnetic flux density Br and coercive force HcJ can be improved without increasing the content of Co by incorporating Pr and/or Nd along with La and Co in the ferrite magnet material.
    Type: Grant
    Filed: October 28, 2005
    Date of Patent: September 16, 2008
    Assignee: TDK Corporation
    Inventors: Junichi Nagaoka, Shigeki Yanagida, Kunio Ohno, Syunsuke Kurasawa, Yoshihiko Minachi
  • Ferrite magnetic material and process for producing the same
    Publication number: 20060091352
    Abstract: The present invention provides a ferrite magnet material comprising, as a main phase, a ferrite having a hexagonal structure, the main phase containing A, La, R, Fe and Co, wherein A is at least one element selected from Sr, Ba and Pb, R is Pr and/or Nd, and the proportions of the total metal elements A, La, R, Fe and Co in the main phase are respectively A: 1 to 13 atomic %, La: 0.003 to 10 atomic %, R: 0 to 10 atomic % (excluding 0) Fe: 80 to 95 atomic % and Co: 0.05 to 5 atomic % based on the total amounts of metal elements. The residual magnetic flux density Br and coercive force HcJ can be improved without increasing the content of Co by incorporating Pr and/or Nd along with La and Co in the ferrite magnet material.
    Type: Application
    Filed: October 28, 2005
    Publication date: May 4, 2006
    Inventors: Junichi Nagaoka, Shigeki Yanagida, Kunio Ohno, Syunsuke Kurasawa, Yoshihiko Minachi