Patents by Inventor Ei Nakamura

Ei Nakamura 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).

  • Magnetic recording member
    Patent number: 5204192
    Abstract: A member is prepared by forming a magnetic surface layer on a magnetic base member having a different composition from the surface layer. A laser beam is radiated onto the member so as to fuse the member and the surface layer, thereby forming a fused portion having magnetic properties. A modified portion is formed in a portion of the fused portion corresponding to the surface layer such that this portion has different permeability from other portions of the surface layer.
    Type: Grant
    Filed: April 1, 1992
    Date of Patent: April 20, 1993
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Machine Co., Ltd.
    Inventors: Ei Nakamura, Mitsuo Sasaki, Nakamura Hiromi
  • Method of forming modified portion and magnetic recording member using this method
    Patent number: 5180609
    Abstract: A member is prepared by forming a magnetic surface layer on a magnetic base member having a different composition from the surface layer. A laser beam is radiated onto the member so as to fuse the member and the surface layer, thereby forming a fused portion having magnetic properties. A modified portion is formed in a portion of the fused portion corresponding to the surface layer such that this portion has different permeability from other portions of the surface layer.
    Type: Grant
    Filed: October 4, 1991
    Date of Patent: January 19, 1993
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Machine Co., Ltd.
    Inventors: Ei Nakamura, Mitsuo Sasaki, Hiromi Nakamura
  • Method of forming a magnetically modified portion
    Patent number: 5100692
    Abstract: A member is prepared by forming a magnetic surface layer on a magnetic base member having a different composition from the surface layer. A laser beam is radiated onto the member so as to fuse the member and the surface layer, thereby forming a fused portion having magnetic properties. A modified portion is formed in a portion of the fused portion corresponding to the surface layer such that this portion has different permeability from other portions of the surface layer.
    Type: Grant
    Filed: March 8, 1989
    Date of Patent: March 31, 1992
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Machine Co., Ltd.
    Inventors: Ei Nakamura, Mitsuo Sasaki, Hiromi Nakamura
  • Method of manufacturing compound superconductors
    Patent number: 4746373
    Abstract: A powder having a predetermined composition is filled in a tube. The tube is drawn to obtain a wire and the wire is rolled to obtain a tape-like starting body. Then, a laser beam is irradiated on the part of the tape to heat and melt the part of the tape. The starting body is rapidly heated and then cooled, thereby the part of the starting body is melted and solidified to form a compound superconductor layer.
    Type: Grant
    Filed: May 14, 1986
    Date of Patent: May 24, 1988
    Assignees: Kabushiki Kaisha Toshiba, National Research Institute for Metals
    Inventors: Yutaka Yamada, Satoru Murase, Mitsuo Sasaki, Ei Nakamura, Hiroaki Kumakura, Kazumasa Togano, Kyoji Tachikawa