Patents by Inventor Friedrich-Wilhelm Ullrich

Friedrich-Wilhelm Ullrich 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 fluorophenylhydrazines and salts thereof
    Publication number: 20030120114
    Abstract: A process is provided for preparing fluorophenylhydrazines and salts thereof in high yields by a simple route of diazotizing fluoroanilines, reducing, hydrolysing and optionally neutralizing.
    Type: Application
    Filed: December 9, 2002
    Publication date: June 26, 2003
    Inventor: Friedrich-Wilhelm Ullrich
  • Method for preparing 2-nitro-5-(phenylthio)-anilines
    Patent number: 6552230
    Abstract: The invention relates to a process for preparing 2-nitro-5-(phenylthio)anilines of formula (I) wherein R1 represents hydrogen, C1-C8-alkyl, C3-C8-cycloalkyl, C1-C8-alkoxy, or halogen and R2 represents hydrogen, C1-C8-alkyl, C3-C8-cycloalkyl, C1-C8-alkoxy, halogen, or C6-C10-aryl optionally substituted with C1-C8-alkyl, C1-C8-alkoxy, or halogen, by reacting, in a solvent, a 5-chloro-2-nitroaniline of the formula (II) wherein R1 is as defined for formula (I), with a thiophenol of the formula (III) wherein R2 is as defined for formula (I), and ammonia.
    Type: Grant
    Filed: December 19, 2000
    Date of Patent: April 22, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Volker Glock, Willi Streicher, Friedrich-Wilhelm Ullrich
  • Method for producing aryl thiols by hydrogenating diaryldisulphides
    Patent number: 6500988
    Abstract: The invention relates to a particularly advantageous method for producing aryl thiols through the catalytic hydrogenation of diaryldisulphides. According to the invention, the hydrogenation is carried out in a basic alcoholic medium.
    Type: Grant
    Filed: April 19, 2000
    Date of Patent: December 31, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Friedrich-Wilhelm Ullrich, Helmut Fiege
  • Process for preparing optionally substituted biphenylcarbonyl chlorides
    Publication number: 20020062043
    Abstract: Optionally substituted biphenylcarbonyl chlorides are obtained in an economically and ecologically advantageous manner by reacting biphenyls with oxalyl chloride in a molar ratio of biphenyl to oxalyl chloride of from 0.7 to 1.5 in the presence of a Lewis acid.
    Type: Application
    Filed: November 7, 2001
    Publication date: May 23, 2002
    Inventors: Lars Rodefeld, Alexander Klausener, Friedrich-Wilhelm Ullrich
  • S-(4-biphenyl)-thiosulphuric acids and their salts, method for producing the same and method for producing 4-mercaptobiphenyls
    Patent number: 6271415
    Abstract: The invention relates to novel S-(4-biphenyl)-thiosulfuric acids and their salts, to a method for producing them from S-(4-biphenyl)-thiosulfinic acids and their salts, and to a method for producing 4-mercaptobiphenyls from the S-(4-biphenyl)-thiosulfuric acids and their salts.
    Type: Grant
    Filed: April 19, 2000
    Date of Patent: August 7, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Friedrich-Wilhelm Ullrich, Helmut Fiege, Wolfgang Eymann
  • Process for the preparation of aromatic maleimides
    Patent number: 5994561
    Abstract: Aromatic maleimides can be prepared by reacting corresponding aromatic amines with maleic anhydride in the presence of a solvent mixture of halogenated hydrocarbon and a dipolar aprotic solvent, with the addition of acid and a polymerization inhibitor.
    Type: Grant
    Filed: July 15, 1999
    Date of Patent: November 30, 1999
    Assignee: Rhein Chemie Rheinau GmbH
    Inventors: Ludger Heiliger, Rudiger Herpich, Josef Kasbauer, Friedrich-Wilhelm Ullrich
  • Process for the preparation of indoles
    Patent number: 5179211
    Abstract: Indoles of the formula ##STR1## can be prepared by reaction of a phenylhydrazine of the formula ##STR2## which is unsubstituted in at least one ortho-position, with a ketone of the formula ##STR3## in an aqueous medium in the presence of an acid compound, less than 5 equivalents, based on 1 mol of phenylhydrazine, of an acid compound having a pK value of 1.3-4.5 being employed.
    Type: Grant
    Filed: November 13, 1991
    Date of Patent: January 12, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heinz U. Blank, Friedrich-Wilhelm Ullrich, Karlheinrich Meisel, Willi Streicher, Nikolaus Schulz, Dieter Irmscher, Gunther Klag
  • Process for the preparation of .mu.-amino-acrylic acid esters
    Patent number: 5030747
    Abstract: .beta.-Amino-acrylic acid esters of the formula(R.sup.1 R.sup.2)NCH.dbd.CR.sup.3 --COOR.sup.4can be obtained by reaction of .beta.-hydroxy-acrylic acid ester alkali metal salts of the formulaMe.sup..sym. .crclbar. OCH.dbd.CR.sup.3 --COOR.sup.4with ammonium salts of the formula(R.sup.1 R.sup.2) NH.sub.2.sup..sym. .crclbar.according to the general reaction equation(R.sup.1 R.sup.2) NH.sub.2 X+MeOCH.dbd.CR.sup.3 --COOR.sup.4 .fwdarw.(R.sup.1 R.sup.2) NCH.dbd.CR.sup.3 --COOR.sup.4 +MeX.dbd.H.sub.2 OR.sup.1, R.sup.2, R.sup.3, R.sup.4, Me.sup..sym. and X.sup..crclbar. having the meaning indicated in the description and the reaction being carried out in an aprotic organic solvent, in which the reaction components are suspended, as the reaction medium and it being possible to replace a part of the aprotic organic solvent by a protic organic solvent which is miscible with the aprotic solvent to give a homogeneous phase.
    Type: Grant
    Filed: March 19, 1990
    Date of Patent: July 9, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heinz U. Blank, Erich Wolters, Friedrich-Wilhelm Ullrich, Halmut Kraus, Gerhard Marzolph, Gunter Silber