Patents by Inventor Hideyuki Ishizu

Hideyuki Ishizu 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).

  • Water absorbent material and absorbent article using same
    Patent number: 6969750
    Abstract: The water absorbent material of the present invention is composed of a copolymer of an anhydropolyamino acid having at least one ethylenically unsaturated double bond in a molecule, a water-soluble monomer having an ethylenically unsaturated double bond and polysaccharides, and has high water absorption ratio and high water absorption rate in pure water or water having a low ion content and also has high absorption properties for high concentration salt-containing solutions.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: November 29, 2005
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Hisakazu Tanaka, Toshiya Kato, Shigeki Ideguchi, Hideyuki Ishizu, Yoshiki Hasegawa
  • Water absorbent material and absorbent article using same
    Publication number: 20050171309
    Abstract: The water absorbent material of the present invention is composed of a copolymer of an anhydropolyamino acid having at least one ethylenically unsaturated double bond in a molecule, a water-soluble monomer having an ethylenically unsaturated double bond and polysaccharides, and has high water absorption ratio and high water absorption rate in pure water or water having a low ion content and also has high absorption properties for high concentration salt-containing solutions.
    Type: Application
    Filed: April 5, 2005
    Publication date: August 4, 2005
    Applicant: DAINIPPON INK AND CHEMICALS, INC.
    Inventors: Hisakazu Tanaka, Toshiya Kato, Shigeki Ideguchi, Hideyuki Ishizu, Yoshiki Hasegawa
  • Water-absorbing material and absorbent article employing the same
    Publication number: 20030045198
    Abstract: The water absorbent material of the present invention is composed of a copolymer of an anhydropolyamino acid having at least one ethylenically unsaturated double bond in a molecule, a water-soluble monomer having an ethylenically unsaturated double bond and polysaccharides, and has high water absorption ratio and high water absorption rate in pure water or water having a low ion content and also has high absorption properties for high concentration salt-containing solutions.
    Type: Application
    Filed: March 22, 2002
    Publication date: March 6, 2003
    Inventors: Hisakazu Tanaka, Toshiya Kato, Shigeki Ideguchi, Hideyuki Ishizu, Yoshiki Hasegawa
  • Processes for producing polycarbonate polyols
    Patent number: 4891421
    Abstract: A process for producing a polycarbonate polyol by ester-interchange reaction of a dialkyl, diaryl or alkylene carbonate and a polyhydroxy compound, wherein the dialkyl, diaryl or alkylene carbonate is purified by adsorption treatment with an adsorbent prior to use in the reaction. A process for producing a polycarbonate polyol which comprises ester-interchange reaction of a dialkyl or diaryl carbonate and a polyhydroxy compound in the presence of a catalyst, wherein the proportion of the polyhydroxy compound to the dialkyl or diaryl carbonate is 1.01 to 1.30 times its stoichiometrical amount, and the amount of the catalyst is 0.0001 to 0.5% by weight, calculated as metal, based on the dialkyl or diaryl carbonate. Also provided is a process for producing a polycarbonate polyol by ester-interchange reaction of a dialkyl, diaryl or alkylene carbonate and a polyhydroxy compound in the presence of a catalyst in an amount, as metal, of 0.0001 to 0.
    Type: Grant
    Filed: June 22, 1988
    Date of Patent: January 2, 1990
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Katsuhide Nishimura, Motoyasu Kunugiza, Hiroharu Shirota, Hideyuki Ishizu