Patents by Inventor Käthe Baumann

Käthe Baumann 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).

  • Fluorine-containing bisphenols, their preparation, their precursors and intermediates, and use of the fluorine-containing bisphenols
    Patent number: 7268260
    Abstract: This invention relates to 1,2-di(4-hydroxyaryl)tetrafluoroethanes of the general formula (I) wherein R are each, independently of one another, hydrogen, F, Cl, Br, I, CN, COOR2, C1-C4-alkyl, C1-C4-alkoxy, C1-C4-alkylthio, C1-C4-perfluoroalkyl, C1-C4-perfluoroalkoxy, C1-C4-perfluoroalkylthio, C1-C4-polyfluoroalkyl, C1-C4-polyfluoroalkoxy, or C1-C4-polyfluoroalkylthio, R2 is C1-C4-alkyl, and n is an integer from 0 to 4. This invention further relates to the preparation of such compounds as well as to precursors and intermediates that can be used in their preparation.
    Type: Grant
    Filed: August 3, 2006
    Date of Patent: September 11, 2007
    Assignee: LANXESS Deutschland GmbH
    Inventors: Albrecht Marhold, Käthe Baumann
  • Fluorine-containing bisphenols, their preparation, their precursors and intermediates, and use of the fluorine-containing bisphenols
    Patent number: 7112704
    Abstract: This invention relates to 1,2-di(4-hydroxyaryl)tetrafluoroethanes of the general formula (I) wherein R are each, independently of one another, hydrogen, F, Cl, Br, I, CN, COOR2, C1–C4-alkyl, C1–C4-alkoxy, C1–C4-alkylthio, C1–C4-perfluoroalkyl, C1–C4-perfluoroalkoxy, C1–C4-perfluoroalkylthio, C1–C4-polyfluoroalkyl, C1–C4-polyfluoroalkoxy, or C1–C4-polyfluoroalkylthio, R2 is C1–C4-alkyl, and n is an integer from 0 to 4. This invention further relates to the preparation of such compounds as well as to precursors and intermediates that can be used in their preparation.
    Type: Grant
    Filed: June 13, 2005
    Date of Patent: September 26, 2006
    Assignee: Bayer Aktiengesellschaft
    Inventors: Albrecht Marhold, Käthe Baumann
  • Flame retardants which contain phosphorus, and flame-retardant thermoplastic molding compositions
    Patent number: 7019056
    Abstract: An oligophosphate of general formula is disclosed. The oligophosphate is suitable as a flame retardant for thermoplastic molding compositions that exhibit a good flame-retardant effect, improved dimensional stability under the effect of heat, a good level of toughness and excellent flowability.
    Type: Grant
    Filed: January 4, 2002
    Date of Patent: March 28, 2006
    Assignee: Bayer Aktiengesellschaft
    Inventors: Andreas Seidel, Käthe Baumann, Thomas Eckel, Michael Zobel, Jörn Stölting, Dieter Wittmann
  • Fluorine-containing bisphenols, their preparation, their precursors and intermediates, and use of the fluorine-containing bisphenols
    Patent number: 6936739
    Abstract: This invention relates to 1,2-di(4-hydroxyaryl)tetrafluoroethanes of the general formula (I) wherein R are each, independently of one another, hydrogen, F, Cl, Br, I, CN, COOR2, C1-C4-alkyl, C1-C4-alkoxy, C1-C4-alkylthio, C1-C4-perfluoroalkyl, C1-C4-perfluoroalkoxy, C1-C4-perfluoroalkylthio, C1-C4-polyfluoroalkyl, C1-C4-polyfluoroalkoxy, or C1-C4-polyfluoroalkylthio, R2 is C1-C4-alkyl, and n is an integer from 0 to 4. This invention further relates to the preparation of such compounds as well as to precursors and intermediates that can be used in their preparation.
    Type: Grant
    Filed: May 29, 2002
    Date of Patent: August 30, 2005
    Assignee: Bayer Aktiengesellschaft
    Inventors: Albrecht Marhold, Käthe Baumann
  • Process for preparing fluorine-containing benzaldehydes
    Patent number: 6596906
    Abstract: The invention relates to a particularly advantageous preparation of fluorine-containing benzaldehydes by reacting a corresponding aromatic acid chloride with hydrogen in the presence of a supported palladium catalyst and a catalyst moderator.
    Type: Grant
    Filed: September 21, 2001
    Date of Patent: July 22, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Käthe Baumann, Albrecht Marhold
  • Preparation of trifluoromethylanilines
    Patent number: 6333434
    Abstract: The invention relates to a process for the preparation of trifluoromethylanilines of formula (I) wherein R1 is hydrogen, fluorine, chlorine, bromine, methyl, monochloromethyl, dichloromethyl, or formyl, and R2 is hydrogen, fluorine or chlorine, with the proviso that when R1 and R2 are both hydrogen, the amino group is para to the trifluoromethyl group, comprising (a) nitrating a benzotrichloride of formula (II)  wherein R1 and R2 are each as defined for formula (I), thereby forming a nitrobenzotrichloride, (b) converting the trichloromethyl group of the nitrobenzotrichloride into a trifluoromethyl group by reaction with anhydrous hydrofluoric acid, thereby forming a nitrobenzotrifluoride, and (c) reducing the nitro groups of the nitrobenzotrifluoride to form a trifluoromethylaniline of formula (I).
    Type: Grant
    Filed: November 6, 2000
    Date of Patent: December 25, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Albrecht Marhold, Käthe Baumann