Patents by Inventor Rudolf Braden

Rudolf Braden 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: 5530169
    Abstract: Saturated, fluorine-containing and chlorine-free hydrocarbons are prepared by catalytically hydrogenating unsaturated, fluorine- and chlorine-containing hydrocarbons at temperatures above 80.degree. C. in the gas phase.
    Type: Grant
    Filed: October 19, 1994
    Date of Patent: June 25, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Dietmar Bielefeldt, Rudolf Braden, Michael Negele, Heinz Ziemann
  • Patent number: 5434310
    Abstract: Acylbenzenes of the formula ##STR1## can be prepared by reaction of benzene with carboxylic acids of the formulaHOOC--R.sup.1 (II)where R.sup.1 has the meaning given in the text, using a molar ratio of benzene:carboxylic acid=1-50:1 at a temperature of 200.degree.-400.degree. C., a zeolite of the Pentasil type having an SiO.sub.2 /M.sup.2 O.sub.2 ratio of 15-500:1 being used as acid catalyst; in the latter formula, M.sup.2 is one element or more from the group comprising Al, B, Ga, In, Fe, Cr, V, As and Sb.
    Type: Grant
    Filed: January 12, 1994
    Date of Patent: July 18, 1995
    Assignee: Bayer Aktiengesellschaft
    Inventors: Helmut Waldmann, Manfred Hajek, Otto Immel, Lothar Puppe, Rudolf Braden
  • Patent number: 5334724
    Abstract: A process for the preparation of a substituted 2-chloropyridine derivatives of the formula ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 represent hydrogen or various other radicals, which comprises reacting a pyridine-1-oxide of the formula ##STR2## with an aromatic carbonyl chloride in the presence of an inert organic solvent and in the presence of an acid acceptor at a temperature between about -20.degree. C. and 200.degree. C.
    Type: Grant
    Filed: June 24, 1992
    Date of Patent: August 2, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Dieter Kaufmann, Klaus Jelich, Rudolf Braden, Winfried Rosen
  • Patent number: 5304525
    Abstract: A process for the preparation of aniline by hydrogenation of nitrobenzene in the gas phase in the presence of a catalyst containing a noble metal is described. The process can be carried out in an improved manner if the catalyst employed is palladium on graphite or petrol coke, as the support, containing 0.001-1% by weight of Pd, based on the total weight of the catalyst, it being possible for the catalyst also to contain, in addition to the Pd, 0.001-0.5% by weight of Ir and/or 0.001-0.3% by weight of Rh, all figures being based on the total weight of the catalyst.
    Type: Grant
    Filed: April 21, 1993
    Date of Patent: April 19, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Otto Immel, Helmut Waldmann, Rudolf Braden, Christian Frohlich, Gerhard Friedhofen, Wilfried Niemeier
  • Patent number: 5245082
    Abstract: Di-(4-aminocyclohexyl)-methane containing 15 to 25% by weight of the trans-trans isomer can be obtained by the catalytic hydrogenation of di-(4-aminophenyl)-methane at elevated temperature and elevated hydrogen pressure in the presence of a ruthenium-containing supported catalyst containing 0.05 to 5% by weight ruthenium on an Al.sub.2 O.sub.3 support which has been treated with compounds of rare earth metals and manganese.
    Type: Grant
    Filed: January 14, 1993
    Date of Patent: September 14, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Otto Immel, Gerhard Darsow, Rudolf Braden, Hans-Helmut Schwarz, Helmut Waldmann
  • Patent number: 5233105
    Abstract: Bismuth/alkaline earth metal catalysts which contain 0.005-0.8 g-atom of bismuth per mol of the alkaline earth metal compound employed and can furthermore contain promoters and/or inert additives, and lanthanide catalysts with or without catalyst supports can be employed as catalysts for halogen-fluorine exchange in organic compounds by means of hydrogen fluoride.
    Type: Grant
    Filed: October 25, 1990
    Date of Patent: August 3, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Helmut Schwarz, Rudolf Braden
  • Patent number: 5180861
    Abstract: Polychloro-fluoro-cyclopentenes can be prepared by catalytic reaction of hexachlorocyclopentadiene with hydrogen fluoride in the gas phase with the addition of chlorine.
    Type: Grant
    Filed: October 11, 1990
    Date of Patent: January 19, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Helmut Schwarz, Rudolf Braden, Albrecht Marhold, Michael Negele
  • Patent number: 5166440
    Abstract: Aromatic amines, alkylated on the N-atom, can be prepared by catalytic alkylation of aromatic amines with alcohols or the corresponding ethers or by transalkylation with aromatic amines alkylated on the N-atom, whereby niobic acid or tantalic acid is used as the catalyst.
    Type: Grant
    Filed: December 12, 1990
    Date of Patent: November 24, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Otto Immel, Helmut Waldmann, Rudolf Braden
  • Patent number: 5145961
    Abstract: 5-Fluoropyrimidines are obtained in an advantageous manner from halogenated 5-unsubstituted pyrimidines, when these are reacted with elemental fluorine in the presence of a solvent.
    Type: Grant
    Filed: February 13, 1992
    Date of Patent: September 8, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Dietmar Bielefeldt, Rudolf Braden
  • Patent number: 5102971
    Abstract: Process for the preparation of polyaromatic compounds in which an aromatic dichloro compound, optionally in the presence of an anhydrous aprotic solvent, is reacted with metallic zinc, manganese or magnesium in the presence of a catalyst system of(1) from 0.1 to 25 mol-% (based on the dihalogen compound) of a nickel salt, nickel complex salt or nickel complex,(2) from 2 to 100 mol per mol of nickel in (1) of a triarylphosphine and optionally(3) from 0.1 to 10 mol per mol of nickel (1) of a halide, sulphate or phosphate of an alkali metal, alkaline earth metal, zinc, magnesium or manganese.
    Type: Grant
    Filed: September 14, 1990
    Date of Patent: April 7, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Himmler, Rudolf Braden, Joachim Genz, Karsten-Josef Idel, Ralf Pakull
  • Patent number: 5097071
    Abstract: The novel copper catalyst on an Al.sub.2 O.sub.3 -containing carrier which is impregnated with compounds of manganese and of one or more rare earth metals, having a Cu content of 0.1-5% by weight, a total content of compounds of manganese and of the rare earth metal or metals of 0.05 to 8% by weight, calculated as metals, is described, the weight ratio of rare earth metal(s) to manganese being 5:1-1:5, calculated as metal, and all percentages being relative to the total weight of the catalyst. Such catalyst is prepared by first impregnating the carrier with compounds of manganese and of the rare earth metal or metals, then fixing the copper salt on the impregnated carrier and activating the catalyst in a preferred manner by treatment with H.sub.2 at 150.degree. to 350.degree. C. Such a catalyst is suitable, for example, for the N-alkylation of aromatic amines with alkanols, where the aromatic amines can be prepared from the parent nitro compounds in an alkylation reactor with simultaneous addition of H.sub.2.
    Type: Grant
    Filed: September 20, 1990
    Date of Patent: March 17, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Otto Immel, Hans-Helmut Schwarz, Rudolf Braden
  • Patent number: 5087747
    Abstract: Trifluoromethanesulphenyl chloride is prepared by reacting bis-(trifluoromethyl)disulfane in the liquid phase with chlorine in the presence of a strong acid.
    Type: Grant
    Filed: May 15, 1990
    Date of Patent: February 11, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Dietmar Bielefeldt, Rudolf Braden, Albrecht Marhold
  • Patent number: 5068343
    Abstract: 4-Substituted 5-chloro-2-hydrazinothiazoles of the formula ##STR1## in which R represents CHF.sub.2, CF.sub.3, CN or COOR.sup.1, whereR.sup.1 represents C.sub.1 -C.sub.4 -alkyl.They are useful as pesticides and as intermediates for other pesticides.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: November 26, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gunter Beck, Ernst Kysela, Rudolf Braden
  • Patent number: 5041683
    Abstract: Process for the preparation of nuclear-fluorinated trifluoromethylbenzaldehydes from nuclear-chlorinated trifluoromethylbenzaldehydes, and new nuclear-fluorinated trifluoromethylbenzaldehydes.
    Type: Grant
    Filed: April 25, 1990
    Date of Patent: August 20, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Albrecht Marhold, Rudolf Braden
  • Patent number: 4990647
    Abstract: Unsymmetric biaryl compounds are prepared by coupling two different halogenoaromatics by reaction with a metal and carrying out the reaction in the presence of catalytic amounts of a nickel compound, a promoter and a phosphorus-containing ligand.
    Type: Grant
    Filed: April 24, 1989
    Date of Patent: February 5, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Himmler, Rudolf Braden
  • Patent number: 4978769
    Abstract: Aromatic, ring-fluorinated compounds are particularly advantageously prepared by nucleophilic exchange in the course of reaction wih potassium fluoride in the presence of phase transfer catalysts and, if desired, solvents by carrying out the reaction in the additional presence of metal salts.
    Type: Grant
    Filed: August 7, 1989
    Date of Patent: December 18, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ernst Kysela, Rudolf Braden
  • Patent number: 4978771
    Abstract: The selective hydrogenation of unsaturated compounds which carry reducible groups containing nitrogen succeeds in a homogeneous phase with the preservation of the reducible groups containing nitrogen, characterized in that a compound of the formulaRuH.sub.2n L.sub.5-nis used as a catalyst, in whichL signifies a phosphane or arsane andn signifies 1 or 2.
    Type: Grant
    Filed: May 18, 1988
    Date of Patent: December 18, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Paul Fiedler, Hartmuth Buding, Rudolf Braden
  • Patent number: 4962246
    Abstract: Benzotrifluorides substituted by fluorine and optionally in addition by chlorine, some of which are new, are prepared by hydrogenating benzotrifluorides which are substituted by fluorine and chlorine, in the presence of a catalyst and a hydrogen chloride acceptor.
    Type: Grant
    Filed: July 7, 1989
    Date of Patent: October 9, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Albrecht Marhold, Rudolf Braden
  • Patent number: 4885415
    Abstract: Benzotrifluorides substituted by fluorine and optionally in addition by chlorine, some of which are new, are prepared by hydrogenating benzotrifluorides which are substituted by fluorine and chlorine, in the presence of a catalyst and a hydrogen chloride acceptor.
    Type: Grant
    Filed: July 15, 1988
    Date of Patent: December 5, 1989
    Assignee: Bayer Aktiengesellschaft
    Inventors: Albrecht Marhold, Rudolf Braden
  • Patent number: RE34548
    Abstract: The selective hydrogenation of unsaturated compounds which carry reducible groups containing nitrogen succeeds in a homogeneous phase with the preservation of the reducible groups containing nitrogen, characterized in that a compound of the formulaRuH.sub.2n L.sub.5-nis used as a catalyst, in whichL signifies a phosphane or arsane andn signifies 1 or 2.
    Type: Grant
    Filed: July 29, 1992
    Date of Patent: February 15, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Paul Fiedler, Hartmuth Buding, Rudolf Braden