Patents by Inventor Keizou Hirai

Keizou Hirai 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).

  • Patent number: 8002860
    Abstract: The present invention discloses a CMP abrasive comprising cerium oxide particles, a dispersant, an organic polymer having an atom or a structure capable of forming a hydrogen bond with a hydroxyl group present on a surface of a film to be polished and water, a method for polishing a substrate comprising polishing a film to be polished by moving a substrate on which the film to be polished is formed and a polishing platen while pressing the substrate against the polishing platen and a polishing cloth and supplying the CMP abrasive between the film to be polished and the polishing cloth, a method for manufacturing a semiconductor device comprising the steps of the above-mentioned polishing method, and an additive for a CMP abrasive comprising an organic polymer having an atom or a structure capable of forming a hydrogen bond with a hydroxyl group present on a surface of a film to be polished, and water.
    Type: Grant
    Filed: June 15, 2009
    Date of Patent: August 23, 2011
    Assignee: Hitachi Chemical Co., Ltd.
    Inventors: Naoyuki Koyama, Kouji Haga, Masato Yoshida, Keizou Hirai, Toranosuke Ashizawa, Youiti Machii
  • Publication number: 20090253355
    Abstract: The present invention discloses a CMP abrasive comprising cerium oxide particles, a dispersant, an organic polymer having an atom or a structure capable of forming a hydrogen bond with a hydroxyl group present on a surface of a film to be polished and water, a method for polishing a substrate comprising polishing a film to be polished by moving a substrate on which the film to be polished is formed and a polishing platen while pressing the substrate against the polishing platen and a polishing cloth and supplying the CMP abrasive between the film to be polished and the polishing cloth, a method for manufacturing a semiconductor device comprising the steps of the above-mentioned polishing method, and an additive for a CMP abrasive comprising an organic polymer having an atom or a structure capable of forming a hydrogen bond with a hydroxyl group present on a surface of a film to be polished, and water.
    Type: Application
    Filed: June 15, 2009
    Publication date: October 8, 2009
    Inventors: Naoyuki Koyama, Kouji Haga, Masato Yoshida, Keizou Hirai, Toranosuke Ashizawa, Youiti Machii
  • Patent number: 7410409
    Abstract: The present invention discloses a CMP abrasive comprising cerium oxide particles, a dispersant, an organic polymer having an atom or a structure capable of forming a hydrogen bond with a hydroxyl group present on a surface of a film to be polished and water, a method for polishing a substrate comprising polishing a film to be polished by moving a substrate on which the film to be polished is formed and a polishing platen while pressing the substrate against the polishing platen and a polishing cloth and supplying the CMP abrasive between the film to be polished and the polishing cloth, a method for manufacturing a semiconductor device comprising the steps of the above-mentioned polishing method, and an additive for a CMP abrasive comprising an organic polymer having an atom or a structure capable of forming a hydrogen bond with a hydroxyl group present on a surface of a film to be polished, and water.
    Type: Grant
    Filed: June 15, 2000
    Date of Patent: August 12, 2008
    Assignee: Hitachi Chemical Co., Ltd.
    Inventors: Naoyuki Koyama, Kouji Haga, Masato Yoshida, Keizou Hirai, Toranosuke Ashizawa, Youiti Machii
  • Publication number: 20070169421
    Abstract: The present invention discloses a CMP abrasive comprising cerium oxide particles, a dispersant, an organic polymer having an atom or a structure capable of forming a hydrogen bond with a hydroxyl group present on a surface of a film to be polished and water, a method for polishing a substrate comprising polishing a film to be polished by moving a substrate on which the film to be polished is formed and a polishing platen while pressing the substrate against the polishing platen and a polishing cloth and supplying the CMP abrasive between the film to be polished and the polishing cloth, a method for manufacturing a semiconductor device comprising the steps of the above-mentioned polishing method, and an additive for a CMP abrasive comprising an organic polymer having an atom or a structure capable of forming a hydrogen bond with a hydroxyl group present on a surface of a film to be polished, and water.
    Type: Application
    Filed: March 23, 2007
    Publication date: July 26, 2007
    Inventors: Naoyuki Koyama, Kouji Haga, Masato Yoshida, Keizou Hirai, Toranosuke Ashizawa, Youiti Machii
  • Patent number: 6615499
    Abstract: The present invention provides a method for producing cerium oxide comprising rapid heating of cerium salts to a calcining temperature to calcine them, a cerium oxide abrasive containing the cerium oxide produced by the method and pure water, an abrasive containing a slurry in which cerium oxide particles having an intensity ratio of an area of a primary peak appearing at 27 to 30° to that of a secondary peak appearing at 32 to 35° (primary peak/secondary peak) in a powder X-ray diffraction chart of 3.20 or more are dispersed in a medium, an abrasive containing a slurry in which cerium oxide particles whose bulk density is 6.5 g/cm3 or less are dispersed into a medium, an abrasive containing a slurry in which abrasive grains having pores are dispersed into a medium, a method for polishing a substrate comprising polishing a predetermined substrate using the abrasive; and a method for manufacturing a semiconductor comprising the step of polishing by the abrasive.
    Type: Grant
    Filed: November 28, 2001
    Date of Patent: September 9, 2003
    Assignee: Hitachi Chemical Co., Ltd.
    Inventors: Jun Matsuzawa, Atsushi Sugimoto, Masato Yoshida, Keizou Hirai, Toranosuke Ashizawa, Yuuto Ootsuki