Patents by Inventor Jan Pfeffer

Jan Pfeffer 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).

  • Method for producing 2,6-dioxabicyclo-(3.3.0)-octane-4,8-dione
    Patent number: 8378127
    Abstract: The invention relates to a method for producing 2,6-dioxabicyclo-(3.3.0)-octane-4,8-dione (I), comprising the oxidation of dianhydrohexitols (II-IV), or of corresponding hydroxy ketones, with an oxygen-containing gas in the presence of a catalyst composition, the reaction proceeding without the addition of halogen sources.
    Type: Grant
    Filed: January 26, 2010
    Date of Patent: February 19, 2013
    Assignee: Evonik Degussa GmbH
    Inventors: Uwe Dingerdissen, Jan Pfeffer, Thomas Tacke, Thomas Haas, Harald Schmidt, Michael Volland, Michael Rimbach, Christian Lettmann, Roger Sheldon, Michiel Janssen
  • COMPOSITIONS BASED ON DIISOCYANATES OBTAINED FROM RENEWABLE RAW MATERIALS
    Publication number: 20120077932
    Abstract: The invention relates to compositions based on 2,5-diisocyanato-1,4:3,6-dianhydro-2,5-dideoxy-D-manitol (I), 2,5-diisocyanato-1,4:3,6-dianhydro-2,5-dideoxy-D-glucitol (II), and/or 2,5-diisocyanato-1,4:3,6-dianhydro-2,5-dideoxy-L-iditol (III), alone or in any mixtures.
    Type: Application
    Filed: April 23, 2010
    Publication date: March 29, 2012
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Jan Pfeffer, Martina Ortelt, Emmanouil Spyrou, Thomas Haas, Uwe Korek, Harald Schmidt, Uwe Dingerdissen
  • REACTIVE DERIVATIVES ON THE BASIS OF DIANHYDROHEXITOL-BASED ISOCYANATES
    Publication number: 20120073472
    Abstract: The invention relates to reactive derivatives on the basis of dianhydrohexitol-based isocyanates.
    Type: Application
    Filed: April 28, 2010
    Publication date: March 29, 2012
    Applicant: EVONIK DEGUSSA GMBH
    Inventors: Emmanouil Spyrou, Jan Pfeffer, Holger Loesch, Marion Ebbing-Ewald, Heinz Grosse-Beck
  • USE OF ISOCYANATES BASED ON RENEWABLE RAW MATERIALS
    Publication number: 20120071577
    Abstract: The invention relates to the use of 2,5-diisocyanato-1,4:3,6-dianhydro-2,5-dideoxy-D-manitol (I), 2,5-diisocyanato-1,4:3,6-dianhydro-2,5-dideoxy-D-glucitol (II), and/or 2,5-diisocyanato-1,4:3,6-dianhydro-2,5-dideoxy-L-iditol (III).
    Type: Application
    Filed: April 23, 2010
    Publication date: March 22, 2012
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Jan Pfeffer, Martina Ortelt, Emmanouil Spyrou, Thomas Haas, Uwe Korek, Harald Schmidt, Uwe Dingerdissen
  • METHOD FOR PRODUCING 2,6-DIOXABICYCLO-(3.3.0)-OCTANE-4,8-DIONE
    Publication number: 20110269977
    Abstract: The invention relates to a method for producing 2,6-dioxabicyclo-(3.3.0)-octane-4,8-dione (I), comprising the oxidation of dianhydrohexitols (II-IV), or of corresponding hydroxy ketones, with an oxygen-containing gas in the presence of a catalyst composition, the reaction proceeding without the addition of halogen sources.
    Type: Application
    Filed: January 26, 2010
    Publication date: November 3, 2011
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Uwe Dingerdissen, Jan Pfeffer, Thomas Tacke, Thomas Haas, Harald Schmidt, Michael Volland, Michael Rimbach, Christian Lettmann, Roger Sheldon, Michiel Janssen
  • METHOD FOR PRODUCING ALDEHYDES AND KETONES FROM PRIMARY AND SECONDARY ALCOHOLS
    Publication number: 20110251399
    Abstract: The invention relates to a method for producing aldehydes and ketones from easily accessible primary and secondary alcohols by oxidation with atmospheric oxygen or pure oxygen using a catalyst system which consists of a derivative of a free nitroxyl radical.
    Type: Application
    Filed: January 25, 2010
    Publication date: October 13, 2011
    Applicant: EVONIK DEGUSSA GMBH
    Inventors: Uwe Dingerdissen, Jan Pfeffer, Thomas Tacke, Thomas Haas, Harald Schmidt, Florian Klasovsky, Roger Sheldon, Michiel Janssen, Michael Volland, Michael Rimbach, Stefanie Rinker
  • METHOD FOR DERACEMIZATION OF ENANTIOMER MIXTURES
    Publication number: 20110070630
    Abstract: The invention relates to a process for enzymatic deracemization of enantiomer mixtures of secondary alcohols by a combination of oxidation and reduction reactions by means of stereoselective alcohol dehydrogenases and the cofactors thereof, wherein one enantiomer of an optically active secondary alcohol is in a formal sense selectively oxidized to the corresponding ketone, which is subsequently reduced selectively to the optical antipode, while the reduced form of the cofactor is provided for the reduction reaction by means of an additional enzyme, characterized in that two alcohol dehydrogenases with opposite stereoselectivity and different cofactor selectivity and the two corresponding, different cofactors are used for the oxidation and reduction reactions, and the oxidized and reduced cofactors are interconverted in a parallel enzymatic reaction with the additional enzyme, the direction of the deracemization toward one of the two enantiomers being controllable by the selection of the two alcohol dehydrogen
    Type: Application
    Filed: March 26, 2009
    Publication date: March 24, 2011
    Applicant: EVONIK DEGUSSA GMBH
    Inventors: Christian Gruber, Wolfgang Kroutil, Constance Voss, Jan Pfeffer, Uwe Dingerdissen