Patents by Inventor Hisako Sakuma

Hisako Sakuma 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).

  • Porous polymer particle, anion exchanger, producing method thereof, column for ion chromatography, and method for measuring anions
    Patent number: 6881761
    Abstract: Disclosed are (1) a porous polymer particle comprising a polymer substrate having ester bonds connected to a group containing a quaternary ammonium structure through a spacer molecule, (2) an alkali-resistant, high-strength porous polymer particle having ester bonds connected to a group containing a quaternary ammonium structure through a spacer molecule, a part of the ester bonds being saponified and converted to a hydroxyl group(s), (3) a porous polymer particle comprising a polymer substrate having ester bonds connected to a group containing a quaternary ammonium structure through a spacer molecule, the porous polymer particles being treated with an alkaline solution to generate a hydroxyl and/or a carboxyl group on a surface of the substrate, (4) an anion exchanger comprising any one of the particles (1) to (3) above, (5) a packing material for anion chromatography comprising the anion exchanger (4) above, (6) a column for anion chromatography using the anion exchanger (4) above, and (7) a method for meas
    Type: Grant
    Filed: March 7, 2001
    Date of Patent: April 19, 2005
    Assignee: Showa Denko K.K.
    Inventors: Takashi Kotsuka, Kuniaki Shimbo, Hiroshi Suzuki, Hisako Sakuma, Toshio Tokuda
  • Porous polymer particle, anion exchanger, producing method thereof, column for ion chromatography, and method for measuring anions
    Publication number: 20020004535
    Abstract: Disclosed are (1) a porous polymer particle comprising a polymer substrate having ester bonds connected to a group containing a quaternary ammonium structure through a spacer molecule, (2) an alkali-resistant, high-strength porous polymer particle having ester bonds connected to a group containing a quaternary ammonium structure through a spacer molecule, a part of the ester bonds being saponified and converted to a hydroxyl group(s), (3) a porous polymer particle comprising a polymer substrate having ester bonds connected to a group containing a quaternary ammonium structure through a spacer molecule, the porous polymer particles being treated with an alkaline solution to generate a hydroxyl and/or a carboxyl group on a surface of the substrate, (4) an anion exchanger comprising any one of the particles (1) to (3) above, (5) a packing material for anion chromatography comprising the anion exchanger (4) above, (6) a column for anion chromatography using the anion exchanger (4) above, and (7) a method for meas
    Type: Application
    Filed: March 7, 2001
    Publication date: January 10, 2002
    Inventors: Takashi Kotsuka, Kuniaki Shimbo, Hiroshi Suzuki, Hisako Sakuma, Toshio Tokuda