Patents by Inventor Soichi Yamada

Soichi Yamada 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 resin granule-containing composition and production process for water-absorbent resin granule
    Patent number: 7153910
    Abstract: The invention provides: a water-absorbent resin granule-containing composition with resolution of various problems, as caused by water-absorbent resin fine powders, and with high granulation strength, and with no physical property deterioration due to granulation, and, if anything, with improvement of the absorption capacity under a load by granulation; and a process for producing the above granule. A water-absorbent resin primary particle and a water-absorbent resin granule are separately surface-crosslinked and then mixed, or mixed and then surface-crosslinked. The granulation is carried out by mixing a preheated aqueous liquid and a water-absorbent resin powder at a high speed or by supplying a water-absorbent resin powder downstream of an aqueous liquid with a continuous extrusion mixer.
    Type: Grant
    Filed: August 5, 2002
    Date of Patent: December 26, 2006
    Assignee: Nippon Shokubai: Co., Ltd.
    Inventors: Yorimichi Dairoku, Kunihiko Ishizaki, Takumi Hatsuda, Kazuhisa Hitomi, Katsuhiro Kajikawa, Soichi Yamada
  • Water-absorbent resin granule-containing composition and production process for water-absorbent resin granule
    Publication number: 20030008946
    Abstract: The invention provides: a water-absorbent resin granule-containing composition with resolution of various problems, as caused by water-absorbent resin fine powders, and with high granulation strength, and with no physical property deterioration due to granulation, and, if anything, with improvement of the absorption capacity under a load by granulation; and a process for producing the above granule. A water-absorbent resin primary particle and a water-absorbent resin granule are separately surface-crosslinked and then mixed, or mixed and then surface-crosslinked. The granulation is carried out by mixing a preheated aqueous liquid and a water-absorbent resin powder at a high speed or by supplying a water-absorbent resin powder downstream of an aqueous liquid with a continuous extrusion mixer.
    Type: Application
    Filed: August 5, 2002
    Publication date: January 9, 2003
    Inventors: Yorimichi Dairoku, Kunihiko Ishizaki, Takumi Hatsuda, Kazuhisa Hitomi, Katsuhiro Kajikawa, Soichi Yamada
  • Water-absorbent resin granule-containing composition and production process for water-absorbent resin granule
    Patent number: 6458921
    Abstract: The invention provides: a water-absorbent resin granule-containing composition with resolution of various problems, as caused by water-absorbent resin fine powders, and with high granulation strength, and with no physical property deterioration due to granulation, and, if anything, with improvement of the absorption capacity under a load by granulation; and a process for producing the above granule. A water-absorbent resin primary particle and a water-absorbent resin granule are separately surface-crosslinked and then mixed, or mixed and then surface-crosslinked. The granulation is carried out by mixing a preheated aqueous liquid and a water-absorbent resin powder at a high speed or by supplying a water-absorbent resin powder downstream of an aqueous liquid with a continuous extrusion mixer.
    Type: Grant
    Filed: August 26, 2000
    Date of Patent: October 1, 2002
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Yorimichi Dairoku, Kunihiko Ishizaki, Takumi Hatsuda, Kazuhisa Hitomi, Katsuhiro Kajikawa, Soichi Yamada
  • Water-absorbent resin granule-containing composition and production process for water-absorbent resin granule
    Patent number: 6228930
    Abstract: The invention provides: a water-absorbent resin granule-containing composition with resolution of various problems, as caused by water-absorbent resin fine powders, and with high granulation strength, and with no physical property deterioration due to granulation, and, if anything, with improvement of the absorption capacity under a load by granulation; and a process for producing the above granule. A water-absorbent resin primary particle and a water-absorbent resin granule are separately surface-crosslinked and then mixed, or mixed and then surface-crosslinked. The granulation is carried out by mixing a preheated aqueous liquid and a water-absorbent resin powder at a high speed or by supplying a water-absorbent resin powder downstream of an aqueous liquid with a continuous extrusion mixer.
    Type: Grant
    Filed: June 10, 1998
    Date of Patent: May 8, 2001
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Yorimichi Dairoku, Kunihiko Ishizaki, Takumi Hatsuda, Kazuhisa Hitomi, Katsuhiro Kajikawa, Soichi Yamada