Patents by Inventor J. Brent Friesen

J. Brent Friesen 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).

  • Reciprocal symmetry plots as a new representation of countercurrent chromatograms
    Patent number: 8175817
    Abstract: Various methods for visualization of output from a liquid-liquid chromatographic instrument are provided. One or more analytes detected by a liquid-liquid chromatographic instrument are visualized by providing a data set comprising a plurality of data points corresponding to one or more analytes detected by the instrument, wherein the data points comprise at least one parameter related to a K-value or a parameter from which a K-value can be determined. A K-value is calculated for at least a portion of the data set, and at least a portion of those K-values transformed by a reciprocal transformation to generate output data having a transformed K-value, wherein the transformed K-value is a real number for all K undergoing the transformation, thereby ensuring that all analytes detected by the instrument are plotted in a single chromatogram. The output data is provided to a user.
    Type: Grant
    Filed: December 20, 2007
    Date of Patent: May 8, 2012
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Guido F. Pauli, J. Brent Friesen
  • Reciprocal Symmetry Plots as a New Representation of Countercurrent Chromatograms
    Publication number: 20080201085
    Abstract: Various methods for visualization of output from a liquid-liquid chromatographic instrument are provided. One or more analytes detected by a liquid-liquid chromatographic instrument are visualized by providing a data set comprising a plurality of data points corresponding to one or more analytes detected by the instrument, wherein the data points comprise at least one parameter related to a K-value or a parameter from which a K-value can be determined. A K-value is calculated for at least a portion of the data set, and at least a portion of those K-values transformed by a reciprocal transformation to generate output data having a transformed K-value, wherein the transformed K-value is a real number for all K undergoing the transformation, thereby ensuring that all analytes detected by the instrument are plotted in a single chromatogram. The output data is provided to a user.
    Type: Application
    Filed: December 20, 2007
    Publication date: August 21, 2008
    Inventors: Guido F. Pauli, J. Brent Friesen