Patents by Inventor Elvira Krebs, legal representative

Elvira Krebs, legal representative 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 enantiomeric enrichment of cis-8-benzyl-7,9-dioxo-2,8-diazabicyclo[4.3.0]nonane
    Patent number: 7709644
    Abstract: The present invention relates to a process for the enantiomeric enrichment of cis-8-benzyl-7,9-dioxo-2,8-diazabicyclo[4.3.0]nonane with the aid of continuous countercurrent chromatography, which is also described as SMB chromatography (SMB=simulated moving bed). In a further aspect, the invention relates to a process for the preparation of (1S,6R)-8-benzyl-7,9-dioxo-2,8-diazabicyclo[4.3.0]nonane using the aforementioned process, which furthermore includes a racemization step.
    Type: Grant
    Filed: January 9, 2007
    Date of Patent: May 4, 2010
    Assignee: LANXESS Deutschland GmbH
    Inventors: Herbert Diehl, Andreas Krebs, Elvira Krebs, legal representative, Walter Lange, Hanns-Ingolf Paul, Dietrich Seidel, Rolf Grosser, Tobias Reichelt