Patents by Inventor Jurgen Riemann

Jurgen Riemann 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).

  • Process for the purification of crude chenodeoxycholic acid
    Patent number: 3965131
    Abstract: Crude chenodeoxycholic acid is purified by subjecting an aqueous solution of an alkali salt thereof to continuous liquid-liquid extraction with a water-immiscible organic solvent until substantially all extractable impurities have been extracted. Crystalline pure free acid is obtained therefrom by acidification of the aqueous solution, extracting the free acid with organic solvent and thereafter removing the solvent, the last portion thereof preferably in the presence of water.
    Type: Grant
    Filed: January 23, 1975
    Date of Patent: June 22, 1976
    Assignee: Schering Aktiengesellschaft
    Inventors: Dietrich Wiele, Jurgen Riemann