Patents by Inventor Günter Rauchschwalbe

Günter Rauchschwalbe 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).

  • Patent number: 7671217
    Abstract: The invention relates to a method for the thermal decarboxylation of dicarboxylic acids, in particular to 3,4-ethylene dioxythiophene-2,5-dicarboxylic acid as an educt. According to said method the educt is used in solid form and/or the reaction is carried out in the presence of a plurality of fluidised bed bodies. No solvents are used in the reaction and the decarboxylation product that is formed during the reaction is carried away from the reaction zone in gaseous form.
    Type: Grant
    Filed: December 4, 2003
    Date of Patent: March 2, 2010
    Assignee: LANXESS Deutschland GmbH
    Inventors: Sigurd Buchholz, Alexander Klausener, Reinhard Langer, Leslaw Mleczko, Günter Rauchschwalbe
  • Patent number: 6888005
    Abstract: A process for the preparation of 2-phenylbenzimidazole-5-sulphonic acid, characterized in that 3,4-diaminobenzenesulphonic acid is reacted at a pH between 4 and 7 in aqueous solution with 0.9 to 1.5 mol of benzaldehyde per mole of 3,4-diaminobenzenesulphonic acid and with 1.0 to 3.0 mol of SO2 per mole of 3,4-diaminobenzenesulphonic acid, or an agent which comprises 1.0 to 3.0 mol of SO2 per mole of 3.4-diaminobenzenesulphonic acid, is described.
    Type: Grant
    Filed: September 16, 2003
    Date of Patent: May 3, 2005
    Assignee: Bayer Aktiengesellschaft
    Inventors: Günter Rauchschwalbe, Herbert Emde, Wolfram Kissener, Klaus-Christian Paetz
  • Patent number: 6825357
    Abstract: The invention relates to substituted or unsubstituted benzodioxinothiophenes, their preparation and their use for preparing electrically conductive oligomers or polymers, also oligomers or polymers comprising these thiophene derivatives as repeating unit.
    Type: Grant
    Filed: July 9, 2002
    Date of Patent: November 30, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Günter Rauchschwalbe, Alexander Klausener, Stephan Kirchmeyer, Knud Reuter
  • Patent number: 6787666
    Abstract: Described herein is a process for the preparation of 3,4-diaminobenzenesulphonic acid, characterized in that 1,2-diaminobenzene is reacted with anhydrous sulphuric acid which optionally comprises SO3 in up to stoichiometric amount, at a temperature in the range from 100 to 160° C. with stirring for a reaction time of from 1 to 20 hours; water or ice is added to the reaction mixture, optionally with cooling, up to a sulphuric acid concentration in the range from 30 to 75% by weight, based on the total mixture; the 3,4-diaminobenzenesulphonic acid precipitated out of the reaction mixture is filtered off, optionally washed with dilute sulphuric acid and worked up.
    Type: Grant
    Filed: September 16, 2003
    Date of Patent: September 7, 2004
    Assignee: Bayer Chemicals AG
    Inventors: Günter Rauchschwalbe, Herbert Emde, Wolfram Kissener
  • Patent number: 6750354
    Abstract: The invention relates to a process for the alkylation of 3,4-dihydroxythiophene-2,5-dicarboxylic esters or their alkali metal or alkaline earth metal salts with alkylating agents in a polar diluent in the presence of quaternary onium salts.
    Type: Grant
    Filed: September 27, 2002
    Date of Patent: June 15, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Günter Rauchschwalbe, Alexander Klausener, Josef Bremen, Ralf-Ingo Schenkel, Adolf Winkler
  • Patent number: 6441182
    Abstract: The invention relates to a method for the production of 2,6-dichloro-5-fluoronicotinic acid by hydrolyzing 2,6-dichloro-5-fluoro-3-cyanopyridine by (a) dissolving 2,6-dichloro-5-fluoro-3-cyanopyridine at 70 to 90° C. in sulfuric acid having a concentration of 90 to 99% by weight and hydrolyzing the 2,6-dichloro-5-fluoro-3-cyanopyridine at 70 to 100° C. to the corresponding carboxamide, (b) cooling the resultant reaction mixture to a temperature in the range from 10 to 65° C., (c) metering in water until the concentration of sulfuric acid is 55 to 75% by weight (calculated relative to the sulfuric acid employed in stage (a) and the water employed in stage (c)) while keeping the temperature between 30 and 65° C. during the addition of the first quarter of the water and keeping the temperature between 50 and 80° C. during the addition of the second quarter of the water, and (d) completing hydrolysis of the resultant mixture to 2,6-dichloro-5-fluoronicotinic acid at 70 to 110° C.
    Type: Grant
    Filed: December 6, 2001
    Date of Patent: August 27, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Günter Rauchschwalbe, Bernd Griehsel, Andreas Sattler, Karsten von dem Bruch
  • Patent number: 6403803
    Abstract: As a result of a special precipitation, it is possible to work up reaction mixtures containing 5-aminomethyl-2-chlorothiazole and bis(2-chlorothiazolyl-5-methyl)amine in an advantageous manner and to isolate bis(2-chlorothiazolyl-5-methyl)amine or its salts.
    Type: Grant
    Filed: December 3, 2001
    Date of Patent: June 11, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventor: Günter Rauchschwalbe
  • Patent number: 6369239
    Abstract: A process for the preparation of dialkoxythiophenes and alkylene-dioxythiophenes in high purity and very good yields by decarboxylation of dialkoxythiophene-dicarboxylic acids or alkylenedioxythiophenedicarboxylic acids, respectively, in solvents that have a higher boiling point than the product and contain no nitrogen bases.
    Type: Grant
    Filed: March 21, 2001
    Date of Patent: April 9, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Günter Rauchschwalbe, Friedrich Jonas