Patents by Inventor Georg Weichselbaumer

Georg Weichselbaumer 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 preparation of chlorinated 4,5-difluorobenzoic acids, -benzoic acid derivatives and -benzaldehydes
    Patent number: 5473095
    Abstract: The present invention relates to a process for the preparation of compounds of the formula ##STR1## in which R.sup.1 is --CN, --COOH, --COOR', R' being an organic radical having 1 to 6 carbon atoms, --CONH.sub.2, --COCl or --CHO and R.sup.2 is H or Cl, which comprises reacting a compound of the formula ##STR2## in which R.sup.1 is as defined above and R.sup.3 is H or Cl, with a chlorinating agent in the presence of a chlorination catalyst at -10.degree. to 200.degree. C.
    Type: Grant
    Filed: January 27, 1994
    Date of Patent: December 5, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Ralf Pfirmann, Theodor Papenfuhs, Georg Weichselbaumer
  • Process for separating catalysts from suspensions by filtration
    Patent number: 5230804
    Abstract: The process for separating off rare metal catalysts used in the preparation of ether-carboxylic acids by catalytic oxidation with a suspended catalyst comprises carrying out a crossflow filtration and pretreating the filter elements used with a medium which is not solid under the treatment conditions and is composed of one or more carboxylic acids.
    Type: Grant
    Filed: March 17, 1992
    Date of Patent: July 27, 1993
    Assignee: Hoechst AG
    Inventors: Ernst I. Leupold, Eduard Zeisberger, Manfred Kauffelt, Willi Herzog, Udo Dettmeier, Georg Weichselbaumer
  • Use of organorhenium compounds for the oxidation of multiple C--C-bonds, oxidation processes based theron and novel organorhenium compounds
    Patent number: 5155247
    Abstract: Compounds of the formula(R.sup.11 Re).sub.k O.sub.1 R.sup.12 .sub.m .multidot.L.sub.n (III)in whichR.sup.11 is a hydrocarbon group which is bonded to the rhenium via a carbon atom to which at least one hydrogen atom is still attached,R.sup.12 is aliphatic hydrocarbon radical which may contain silicon bridge atoms, or is an unsubstituted or substituted phenyl radical,L is a ligand which is bonded to the rhenium metal via one to three oxygen and/or nitrogen atoms, and theindex k is 1 or 2, the index 1 is an integer from 1 to three times k, the index m is zero or an integer from 1 to twice k, and the index n is an integer from 1 to three times k, and in which the indices k, l, m and n are selected such that their combination satisfies the 5-, 6- or 7-valence of rhenium.The invention also provides compounds of the formula(polymer).sub.f .multidot.(CH.sub.3 ReO.sub.3).sub.8 (VI)in which the rhenium compound CH.sub.3 ReO.sub.3 is bonded to the polymer via amine or amide nitrogen in the polymer.
    Type: Grant
    Filed: January 25, 1990
    Date of Patent: October 13, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Wolfgang A. Herrmann, Dieter M. Fritz-Meyer-Weg, Werner Wagner, Josef G. Kuchler, Georg Weichselbaumer, Richard Fischer