Patents by Inventor John Brent Friesen

John 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).

  • Selection and rational development of solvent systems in counter-current chromatograph
    Patent number: 8062898
    Abstract: Application of a reference mixture of natural products for systematic analysis and comparison of the properties of biphasic solvent systems in counter-current/partition chromatography. Because the reference mixture is comprised of compounds with varying polarities, functional groups, and structural features it provides a rational method for mapping the optimal resolution polarity range of a particular solvent system. The mapping of optimal resolution polarity ranges of solvent systems provided for the description of the overall optimal resolution polarity range of a solvent system family, comprised of the same solvents in different proportions. By comparing the reference mixture performance in the individual members of a solvent system family, the solvent system that best functions as the representative of, or portal to, the solvent system families is determined. Use of the reference mixture also afforded a method to compare the overall optimal resolution polarity ranges of solvent system families.
    Type: Grant
    Filed: October 22, 2007
    Date of Patent: November 22, 2011
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Guido F. Pauli, John Brent Friesen
  • SELECTION AND RATIONAL DEVELOPMENT OF SOLVENT SYSTEMS IN COUNTER-CURRENT CHROMATOGRAPH
    Publication number: 20080127720
    Abstract: Application of a reference mixture of natural products for systematic analysis and comparison of the properties of biphasic solvent systems in counter-current/partition chromatography. Because the reference mixture is comprised of compounds with varying polarities, functional groups, and structural features it provides a rational method for mapping the optimal resolution polarity range of a particular solvent system. The mapping of optimal resolution polarity ranges of solvent systems provided for the description of the overall optimal resolution polarity range of a solvent system family, comprised of the same solvents in different proportions. By comparing the reference mixture performance in the individual members of a solvent system family, the solvent system that best functions as the representative of, or portal to, the solvent system families is determined. Use of the reference mixture also afforded a method to compare the overall optimal resolution polarity ranges of solvent system families.
    Type: Application
    Filed: October 22, 2007
    Publication date: June 5, 2008
    Inventors: Guido F. Pauli, John Brent Friesen