Patents by Inventor Christian Döbler

Christian Döbler 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 asymmetric epoxidation of olefins
    Patent number: 7544819
    Abstract: The present invention relates to a catalyst based on ruthenium complexes and to a process for the asymmetric epoxidation of olefins using catalysts based on ruthenium complexes.
    Type: Grant
    Filed: February 4, 2005
    Date of Patent: June 9, 2009
    Assignee: Lanxess Deutschland GmbH
    Inventors: Wolfgang Maegerlein, Matthias Beller, Christian Döbler, Man Kin Tse, Santosh Bhor, Markus Klawonn
  • Method for the dihydroxylation of olefins using transition metal catalysts
    Patent number: 6825377
    Abstract: This invention relates to process for dihydroxylation of olefins using transition metal catalysts to obtain monofunctional, bifunctional, and/or polyfunctional 1,2-diols of the formula (I) R1R2C(OH)—C(OH)R3R4  (I) where R1 to R4 are defined herein, by reacting an olefin of the formula (II) R1R2C═CR3R4  (II) where R1 to R4 are defined as for formula (I), with molecular oxygen in the presence of an osmium, ruthenium, or manganese compound in water or a water-containing solvent mixture at a pH of from 7.5 to 13.
    Type: Grant
    Filed: October 19, 2001
    Date of Patent: November 30, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Matthias Beller, Christian Döbler, Gerald Mehltretter, Uta Sundermeier
  • Optical ADD-DROP module which can be expanded modularly
    Patent number: 6795606
    Abstract: In a first ADD-DROP module, a WDM signal is supplied to a first filter arrangement which selects two channels and supplies the remaining channels to a cascading switching device. The channels selected by the first filter device can be dropped by an ADD-DROP switching device or switched through the module. The ADD channels switched through or newly added are combined with the remaining channels in an ADD filter arrangement to form a newly configured WDM output signal. A further ADD-DROP module (M2) which allows two further channels to be dropped and added can be connected, in turn, via cascading terminals.
    Type: Grant
    Filed: September 20, 2001
    Date of Patent: September 21, 2004
    Assignee: Siemens Aktiengesellschaft
    Inventors: Christian Döbler, Patrick Leisching
  • Preparation of carbonyl compounds from alcohols
    Patent number: 6790997
    Abstract: The invention relates to a process for the preparation of carbonyl compounds by the oxidation of alcohols in the presence of osmium compounds as catalysts in water or a solvent mixture containing water.
    Type: Grant
    Filed: July 23, 2002
    Date of Patent: September 14, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Markus Eckert, Hans-Christian Militzer, Matthias Beller, Christian Döbler, Gerald Mehltretter, Uta Sundermeier
  • Method for the asymmetric dihydroxylation of olefins, using osmium catalysts
    Patent number: 6472570
    Abstract: This invention relates to process for asymmetric dihydroxylation of olefins using osmium catalysts to obtain monofunctional, bifunctional, and/or polyfunctional chiral 1,2-diols of the formula (I) R1R2C(OH)—C(OH)R3R4  (I) where R1 to R4 are defined herein, by reacting an olefin of the formula (II) R1R2C═CR3R4  (II) where R1 to R4 are defined as for formula (I), with molecular oxygen in the presence of an osmium compound and a chiral amine ligand in water or a water-containing solvent mixture at a pH of from 8.5 to 13.
    Type: Grant
    Filed: October 19, 2001
    Date of Patent: October 29, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Matthias Beller, Christian Döbler, Gerald Mehltretter, Uta Sundermeier