Patents by Inventor Yumiko Kozasa

Yumiko Kozasa 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).

  • Piezoelectric ceramic composition and laminated piezoelectric element
    Patent number: 7507347
    Abstract: Provided is a piezoelectric ceramic composition capable of being sintered at low temperatures and in a low-oxygen reductive atmosphere and capable of attaining a sufficient displacement even at high voltages of 1 kV/mm or more. The piezoelectric ceramic composition includes: a composite oxide, as a main constituent thereof, represented by the following composition formula; Cu and/or Ag, each as a first additive, Cu being included in a content ?, in terms of Cu2O, falling within a range 0<??0.5% by mass and Ag being included in a content ?, in terms of Ag2O, falling within a range 0<??0.4% by mass, in relation to the main constituent; wherein: composition formula: Pba[(Zn1/3Nb2/3)xTiyZrz]O3, where 0.96?a?1.03, 0.005?x<0.05, 0.42?y?0.53, 0.45?z?0.56, and x+y+z=1.
    Type: Grant
    Filed: March 15, 2007
    Date of Patent: March 24, 2009
    Assignee: TDK Corporation
    Inventors: Kumiko Iezumi, Junichi Yamazaki, Norimasa Sakamoto, Takeo Tsukada, Masahito Furukawa, Keisuke Itakura, Hideya Sakamoto, Yumiko Kozasa, Masayoshi Inoue, Masaru Nanao, Satoshi Ozawa
  • PIEZOELECTRIC CERAMIC COMPOSITION AND LAMINATED PIEZOELECTRIC ELEMENT
    Publication number: 20070222341
    Abstract: Provided is a piezoelectric ceramic composition capable of being sintered at low temperatures and in a low-oxygen reductive atmosphere and capable of attaining a sufficient displacement even at high voltages of 1 kV/mm or more. The piezoelectric ceramic composition includes: a composite oxide, as a main constituent thereof, represented by the following composition formula; Cu and/or Ag, each as a first additive, Cu being included in a content ?, in terms of Cu2O, falling within a range 0<??0.5% by mass and Ag being included in a content ?, in terms of Ag2O, falling within a range 0<??0.4% by mass, in relation to the main constituent; wherein: composition formula: Pba[(Zn1/3Nb2/3)xTiyZrz]O3, where 0.96?a?1.03, 0.005?x<0.05, 0.42?y?0.53, 0.45?z?0.56, and x+y+z=1.
    Type: Application
    Filed: March 15, 2007
    Publication date: September 27, 2007
    Applicant: TDK CORPORATION
    Inventors: Kumiko Iezumi, Junichi Yamazaki, Norimasa Sakamoto, Takeo Tsukada, Masahito Furukawa, Keisuke Itakura, Hideya Sakamoto, Yumiko Kozasa, Masayoshi Inoue, Masaru Nanao, Satoshi Ozawa