Patents by Inventor Xa Her

Xa Her 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).

  • Preparative-scale separation of enantiomers of chiral carboxylic acids
    Patent number: 8076511
    Abstract: High yields and purity are obtained in the purification of enantiomers of chiral carboxylic acids by preparative-scale chromatography by including a tertiary alcohol in the mobile phase in conjunction with an acidic modifier and a hydrophobic solvent. The tertiary alcohol is superior to other, more commonly used alcohols by reducing the extent of esterification of the enantiomer that otherwise lowers the yield and the purity.
    Type: Grant
    Filed: May 18, 2007
    Date of Patent: December 13, 2011
    Assignee: Ampac Fine Chemicals LLC.
    Inventors: Der-Shing Huang, Olivier Dapremont, Patrick Berget, Xa Her, Darin Sanchez
  • PREPARATIVE-SCALE SEPARATION OF ENANTIOMERS OF CHIRAL CARBOXYLIC ACIDS
    Publication number: 20080287704
    Abstract: High yields and purity are obtained in the purification of enantiomers of chiral carboxylic acids by preparative-scale chromatography by including a tertiary alcohol in the mobile phase in conjunction with an acidic modifier and a hydrophobic solvent. The tertiary alcohol is superior to other, more commonly used alcohols by reducing the extent of esterification of the enantiomer that otherwise lowers the yield and the purity.
    Type: Application
    Filed: May 18, 2007
    Publication date: November 20, 2008
    Applicant: AMPAC Fine Chemicals LLC
    Inventors: Der-Shing Huang, Olivier Dapremont, Patrick Berget, Xa Her, Darin Sanchez