Patents by Inventor Kazuto Harada

Kazuto Harada 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).

  • Absorbents with improved water absorbing power
    Patent number: 4251643
    Abstract: Absorbent materials for aqueous fluids, which absorb fluid rapidly and swell uniformly, comprise modified polyvinyl alcohol polymers obtained by reacting in an anhydrous condition a polyvinyl alcohol polymer with a cyclic acid anhydride and causing partial crosslinking of said polymer. Absorbent articles such as diapers, sanitary napkins, sanitary tampons, blood absorbents for use in surgical operations, bandages and dressings comprise said absorbent materials and fluid absorbing holders therefor.
    Type: Grant
    Filed: March 16, 1979
    Date of Patent: February 17, 1981
    Assignee: Kuraray Co., Ltd.
    Inventors: Kazuto Harada, Toshihiko Yoshitake