Patents by Inventor Kouki Okayama

Kouki Okayama 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).

  • Cordierite sintered body and member for semiconductor device composed of cordierite sintered body
    Patent number: 9073790
    Abstract: A cordierite sintered body and a member for semiconductor manufacturing apparatus are disclosed. The cordierite sintered body includes a crystal phase and an amorphous phase. The crystal phase includes a main crystal phase that essentially consists of cordierite crystal grains; and a sub crystal phase that includes sub crystal grains containing alumina, mullite or sapphirine. The amorphous phase contains calcium and is located at grain boundaries of the cordierite crystal grains and the sub crystal grains. A crystal phase proportion of the main crystal phase to the crystal phase (or total of the main crystal phase and the sub crystal phase) is 95% to 97.5% by mass or less. A crystal phase proportion of the sub crystal phase to the crystal phase is 2.5% to 5% by mass or less. The sintered body contains calcium by 0.4% to 0.6% by mass or less in terms of CaO.
    Type: Grant
    Filed: February 22, 2012
    Date of Patent: July 7, 2015
    Assignee: Kyocera Corporation
    Inventors: Tatsuji Furuse, Hiroaki Seno, Shuichi Iida, Kouki Okayama, Toshiaki Shigeoka
  • CORDIERITE SINTERED BODY AND MEMBER FOR SEMICONDUCTOR DEVICE COMPOSED OF CORDIERITE SINTERED BODY
    Publication number: 20140171288
    Abstract: A cordierite sintered body and a member for semiconductor manufacturing apparatus are disclosed. The cordierite sintered body includes a crystal phase and an amorphous phase. The crystal phase includes a main crystal phase that essentially consists of cordierite crystal grains; and a sub crystal phase that includes sub crystal grains containing alumina, mullite or sapphirine. The amorphous phase contains calcium and is located at grain boundaries of the cordierite crystal grains and the sub crystal grains. A crystal phase proportion of the main crystal phase to the crystal phase (or total of the main crystal phase and the sub crystal phase) is 95% to 97.5% by mass or less. A crystal phase proportion of the sub crystal phase to the crystal phase is 2.5% to 5% by mass or less. The sintered body contains calcium by 0.4% to 0.6% by mass or less in terms of CaO.
    Type: Application
    Filed: February 22, 2012
    Publication date: June 19, 2014
    Applicant: KYOCERA CORPORATION
    Inventors: Kouki Okayama, Shuichi Iida, Shuichi Iida, Kouki Okayama, Toshiaki Shigecka