Patents by Inventor Keith J. Duff

Keith J. Duff 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).

  • Chiral mobile phase additives for improved liquid-chromatography separations
    Patent number: 5338454
    Abstract: Chromatographic separations and resolutions of racemic mixtures and diastereoisomers are enhanced by simultaneously employing an enantiomeric, chiral stationary phase (CSP) and an enantiomeric, chiral mobile phase additive (CMPA) bearing a stereoisomeric relationship to the CSP but having the opposite chirality are enhanced relative to the use of either a CSP or a CMPA alone. Specific CMPA compositions having the structural formulas ##STR1## are also disclosed.
    Type: Grant
    Filed: August 27, 1992
    Date of Patent: August 16, 1994
    Assignee: Supelco, Incorporated
    Inventor: Keith J. Duff