Patents by Inventor George C. Sypniewski

George C. Sypniewski 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).

  • Imbiber polymers alkylated after polymerization
    Patent number: 4895909
    Abstract: Effective organic fluid-insoluble organic fluid-swellable polymer particles are prepared from vinyl aromatic polymer particles. Alkyl halide alkylating agents are allowed to react with the vinyl aromatic polymer particles after they are swollen by an organic swelling medium. At least a portion of the organic swelling medium may optionally be removed. The particles may optionally be swollen with at least one additional monomer, which may then be polymerized.
    Type: Grant
    Filed: March 10, 1989
    Date of Patent: January 23, 1990
    Assignee: The Dow Chemical Company
    Inventor: George C. Sypniewski
  • Alkylation of vinyl aromatic polymer
    Patent number: 4835222
    Abstract: Effective organic fluid-insoluble organic fluid-swellable polymer particles are prepared from vinyl aromatic polymer particles. Alkyl halide alkylating agents are allowed to react with the vinyl aromatic polymer particles after they are swollen by an organic swelling medium. At least a portion of the organic swelling medium may optionally be removed. The particles may optionally be swollen with at least one additional monomer, which may then be polymerized.
    Type: Grant
    Filed: May 16, 1988
    Date of Patent: May 30, 1989
    Assignee: The Dow Chemical Company
    Inventor: George C. Sypniewski