Patents by Inventor Youji Hirao

Youji Hirao 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).

  • Retainer ring used for polishing a structure for manufacturing magnetic head, and polishing method using the same
    Patent number: 7867060
    Abstract: Disclosed is a polishing method for polishing a surface of a structure for magnetic-head manufacture by CMP in the process of manufacturing a magnetic head using a ceramic substrate made of a ceramic material containing AlTiC, the structure including the ceramic substrate and one or more layers formed thereon, and having the surface to be polished. The polishing method uses a retainer ring made of a ceramic material containing AlTiC.
    Type: Grant
    Filed: March 31, 2008
    Date of Patent: January 11, 2011
    Assignee: TDK Corporation
    Inventors: Hiroki Aritomo, Tetsuji Hori, Akira Miyasaka, Youji Hirao
  • Retainer ring used for polishing a structure for manufacturing magnetic head, and polishing method using the same
    Publication number: 20090247060
    Abstract: Disclosed is a polishing method for polishing a surface of a structure for magnetic-head manufacture by CMP in the process of manufacturing a magnetic head using a ceramic substrate made of a ceramic material containing AlTiC, the structure including the ceramic substrate and one or more layers formed thereon, and having the surface to be polished. The polishing method uses a retainer ring made of a ceramic material containing AlTiC.
    Type: Application
    Filed: March 31, 2008
    Publication date: October 1, 2009
    Applicants: TDK CORPORATION, MARUSHIN-INDUSTRY CO., LTD.
    Inventors: Hiroki Aritomo, Tetsuji Hori, Akira Miyasaka, Youji Hirao