Patents by Inventor Birgit Drieben-Holscher

Birgit Drieben-Holscher 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 monophosphorus compounds
    Publication number: 20060183930
    Abstract: The present invention relates to catalysts comprising chiral monophosphorus compounds and their use, the chiral monophosphorus compounds themselves and also their precursors.
    Type: Application
    Filed: April 10, 2006
    Publication date: August 17, 2006
    Inventors: Claus Dreisbach, Benjamin Meseguer, Thomas Prinz, Ulrich Scholz, Hans-Christian Militzer, Friederike Agel, Birgit Drieben-Holscher
  • Biphenydiols
    Patent number: 6844462
    Abstract: The invention relates to the biphenyldiols of the formula (V) The corresponding racemic and enantiomerically pure triflate compounds thereof, where R1 and R2 are H, R3 is chlorine, and R4 is methoxy. In an alternate embodiment, R1 and R2 are hydrogen and R3 and R4 are C1-C4-alkoxy, fluorine, or chlorine.
    Type: Grant
    Filed: April 7, 2003
    Date of Patent: January 18, 2005
    Assignee: Bayer Aktiengesellschaft
    Inventors: Birgit Drieben-Hölscher, Joachim Kralik, Inga Ritzkopf, Christian Steffens, Guido Giffels, Claus Dreisbach, Thomas Prinz
  • Diphosphines
    Publication number: 20030181736
    Abstract: The invention relates to the preparation and use as catalysts of diphosphines of the formula (I) 1
    Type: Application
    Filed: April 7, 2003
    Publication date: September 25, 2003
    Inventors: Birgit Drieben-Holscher, Joachim Kralik, Inga Ritzkopf, Christian Steffens, Guido Giffels, Claus Dreisbach, Thomas Prinz