Patents by Inventor Christiane Husemann

Christiane Husemann 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).

  • Preparation of polyaryl ethers with nitrogen compound catalysts
    Patent number: 5298592
    Abstract: A process for preparing polyaryl ethers of the formula I or Ia ##STR1## by condensation of at least one appropriate bisphenol with at least one appropriate aromatic dichloride in the presence of an alkali metal carbonate in a dipolar aprotic solvent, is carried out in the presence of a catalyst selected from the alkali metal nitrites and the group of compounds of the formula II ##STR2## where r.sup.1 and r.sup.3 are each hydrogen, C.sub.7 -C.sub.16 -phenylalkyl, C.sub.1 -C.sub.12 -alkoxy, fluorine, chlorine, bromine, iodine or nitro, and R.sup.2 is nitro or nitroso, or ##STR3## where R.sup.4 is hydrogen, C.sub.1 -C.sub.4 alkyl, fluorine, chlorine, bromine or iodine.
    Type: Grant
    Filed: August 20, 1992
    Date of Patent: March 29, 1994
    Assignee: BASF Aktiengesellschaft
    Inventors: Alexander Aumueller, Wolfgang Eberle, Gerhard Heinz, Bernd Hupfeld, Christiane Husemann, Juergen Koch, Helmut Reichelt