Patents by Inventor Stephan Klein

Stephan Klein 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 production of a dinitronaphthalene isomer mixture with a high proportion of 1,5-dinitronaphthalene
    Patent number: 6737554
    Abstract: The present invention relates to a process for the production of a dinitronaphthalene isomer mixture, in which naphthalene and/or 1-nitronaphthalene is reacted with nitric acid in the presence of a zeolite.
    Type: Grant
    Filed: February 28, 2003
    Date of Patent: May 18, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Matthias Brandt, Stephan Klein, Gerhard Wegener
  • Method for producing silanes
    Publication number: 20040030171
    Abstract: The invention relates to a method of producing silane or hydrochlorosilanes by disproportionation of a higher chlorinated hydrochlorosilane or a mixture of said hydrochlorosilanes in the presence of a catalyst. Before the catalyst is used, it is a) washed with hyper-pure water in one or several steps; b) transferred in the water-moist state to the reactor in which the disproportionation is to proceed; c) treated in the reactor with boiling methanol or rinsed with anhydrous methanol; and d) the methanol is removed from the catalyst by evacuation and/or stripping with inert gas. The invention further relates to a method for treating disproportionation catalysts.
    Type: Application
    Filed: May 20, 2003
    Publication date: February 12, 2004
    Inventors: Stephan Klein, Hans-Dieter Block, Hans-Joachim Leimkuhler, Werner Dick, Dirk Muller, Johannes-Peter Schafer
  • Method for purifying trichlorosilane
    Publication number: 20040028594
    Abstract: The invention relates to a method for removing anhydrous acids and hydrohalogens from trichlorosilane by contacting the trichlorosilane with solid bases. The invention further relates to the use of the trichlorosilane so purified in the production of silane and/or super-pure silicon.
    Type: Application
    Filed: May 14, 2003
    Publication date: February 12, 2004
    Inventors: Stephan Klein, Hans-Dieter Block, Hans-Joachim Leimkuhler, Werner Dick, Johannes-Peter Schafer
  • Method for production of diaminodiphenylmethanes
    Patent number: 6649798
    Abstract: The present invention concerns a process for the production of methylenedianiline (MDA) having a high monomer content.
    Type: Grant
    Filed: August 7, 2002
    Date of Patent: November 18, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Stephan Klein, Dirk Grotjohann, Christine Mendoza-Frohn, Daniel Koch, Heinz-Herbert Müller, Hans-Georg Pirkl, Rudolf Uchdorf, Gerhard Wegener
  • Process for the production of a dinitronaphthalene isomer mixture with a high proportion of 1,5-dinitronaphthalene
    Publication number: 20030171627
    Abstract: The present invention relates to a process for the production of a dinitronaphthalene isomer mixture, in which naphthalene and/or 1-nitronaphthalene is reacted with nitric acid in the presence of a zeolite.
    Type: Application
    Filed: February 28, 2003
    Publication date: September 11, 2003
    Inventors: Mathias Brandt, Stephan Klein, Gerhard Wegener
  • Process for preparing cycloalkadienes
    Publication number: 20030069460
    Abstract: The present invention relates to a process for preparing cycloalkadienes using supported catalysts based on Re2O7/&ggr;-Al2O3 and also to the use of the resulting cycloalkadienes for the preparation of fragrances.
    Type: Application
    Filed: August 23, 2002
    Publication date: April 10, 2003
    Inventors: Ingo Wohrle, Peter Esser, Aurelia Reckziegel, Matthias Brandt, Stephan Klein, Thomas Turek
  • Metathesis catalysts
    Publication number: 20030065234
    Abstract: The present invention relates to supported catalysts based on Re2O7/(—Al2O3 for use in the preparation of cycloalkadienes in a metathesis reaction, a process for preparing cycloalkadienes in the presence of these supported catalysts and also the use of the resulting cycloalkadienes for preparing fragrances.
    Type: Application
    Filed: August 23, 2002
    Publication date: April 3, 2003
    Inventors: Ingo Wohrle, Peter Esser, Aurelia Reckziegel, Matthias Brandt, Stephan Klein, Thomas Turek
  • Cinnamic esters
    Patent number: 6531625
    Abstract: In a novel process for the synthesis of cinnamic esters or substituted cinnamic esters, carboxylic esters are reacted, by condensation, with benzaldehyde or substituted benzaldehydes, respectively, in the presence of a solid with basic properties.
    Type: Grant
    Filed: September 5, 2001
    Date of Patent: March 11, 2003
    Assignee: Haarmann & Reimber GmbH
    Inventors: Walter Kuhn, Gerhard Braun, Stephan Klein
  • Method for production of diaminodiphenylmethanes
    Publication number: 20030023116
    Abstract: The present invention concerns a process for the production of methylenedianiline (MDA) having a high monomer content.
    Type: Application
    Filed: August 7, 2002
    Publication date: January 30, 2003
    Inventors: Stephan Klein, Dirk Grotjohann, Christine Mendoza-Frohn, Daniel Koch, Heinz-Herbert Mller, Hans-Georg Pirkl, Rudolf Uchdorf
  • Process for the preparation of macrocyclic esters
    Patent number: 6458972
    Abstract: Macrocyclic ester compounds can be prepared from oligoesters by thermal cleavage in the presence of a thermostable benzene derivative.
    Type: Grant
    Filed: August 21, 2001
    Date of Patent: October 1, 2002
    Assignee: Haarmann & Reimer GmbH
    Inventors: Horst Surburg, Dirk Müller, Stephan Klein, Christine Mendoza-Frohn, Georg Ronge, Kai Verkerk
  • Cinnamic esters
    Publication number: 20020133038
    Abstract: In a novel process for the synthesis of cinnamic esters or substituted cinnamic esters, carboxylic esters are reacted, by condensation, with benzaldehyde or substituted benzaldehydes, respectively, in the presence of a solid with basic properties.
    Type: Application
    Filed: September 5, 2001
    Publication date: September 19, 2002
    Inventors: Walter Kuhn, Gerhard Braun, Stephan Klein
  • Process for the preparation of macrocyclic esters
    Publication number: 20020095045
    Abstract: Macrocyclic ester compounds can be prepared from oligoesters by thermal cleavage in the presence of a thermostable benzene derivative.
    Type: Application
    Filed: August 21, 2001
    Publication date: July 18, 2002
    Inventors: Horst Surburg, Dirk Muller, Stephan Klein, Christine Mendoza-Frohn, Georg Ronge, Kai Verkerk