Patents by Inventor Sergej Schapowalov

Sergej Schapowalov 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).

  • Modified superabsorbent polymer based on polyacrylonitrile emulsions
    Patent number: 6288158
    Abstract: A process for modifying superabsorbent polymers is disclosed. The surface of a polymer containing hydrolyzed polyacrylonitrile in the form of particulates, is modified by crosslinking in a water/alcohol reaction mixture and in the presence of silica. The resulting product features improved absorbency under load and lesser degree of gel blocking.
    Type: Grant
    Filed: February 9, 1999
    Date of Patent: September 11, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Sergej Schapowalov, Günter Sackmann, Rolf-Volker Meyer, Siegfried Korte