Patents by Inventor Shioko Yoshinaka

Shioko Yoshinaka 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).

  • Process for preparing water-absorbent resin
    Patent number: 6573330
    Abstract: A process for preparing a water-absorbent resin is provided which enables the water-absorbent resin to ensure the reduction in the release amount of liquid and the increase in the liquid diffusibility. In the preparation process, the water-absorbent resin is prepared by polymerization of a water-soluble ethylenic unsaturated monomer. The polymerization of the water-soluble ethylenic unsaturated monomer is allowed to take place in the presence of a water-absorbent resin having a water-absorbing rate different from that of a water-absorbent resin resulting from polymerization of the water-soluble ethylenic unsaturated monomer. In a preferred mode, the polymerization is performed by a reversed-phase suspension polymerization method.
    Type: Grant
    Filed: December 10, 1998
    Date of Patent: June 3, 2003
    Assignee: Sumitomo Seika Chemicals, Co., Ltd.
    Inventors: Masato Fujikake, Yasuhiro Nawata, Magoto Shirakawa, Masakazu Yamamori, Shioko Yoshinaka, Morio Nakamura