Patents by Inventor James Charles Hatfield

James Charles Hatfield 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).

  • Membrane separation process for metal complex catalysts
    Patent number: 6252123
    Abstract: This invention relates to a process for the separation of a metal complex catalyst and any free ligand which may be present, from a homogeneous organic synthesis reaction mixture using sub-nanoporous, chemically stable membranes having discrete pores which allow organic products and by-products to pass through the membrane as permeate while retaining substantially all of the metal complex catalyst and free ligand, if any, as retentate.
    Type: Grant
    Filed: July 8, 1999
    Date of Patent: June 26, 2001
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventors: Jay Fingeret Miller, Joan Ayer Rodberg, Brian Michael Roesch, George Ernest Keller, II, Lisa Evans Curry, Paul Frank Bryan, John Edward Davis, James Charles Hatfield
  • Selective hydrolysis of saturated esters over unsaturated esters using enzymes
    Patent number: 5856150
    Abstract: Processes are disclosed for the selective hydrolysis of saturated esters, e.g., ethyl propionate, over unsaturated esters, e.g., ethyl acrylate, using enzymes, e.g., lipases. The processes are useful, for example, for removing undesired esters from monomer feeds used in latex polymerization and from the latexes after polymerization. The processes can be used, for example, to treat latexes used in hair fixative compositions to remove unpleasant odors.
    Type: Grant
    Filed: September 12, 1997
    Date of Patent: January 5, 1999
    Assignee: Amerchol Corporation
    Inventors: Kevin Andrew DiGregorio, James Charles Hatfield, George Ernest Keller