Patents by Inventor Walter-Wielant Wiersdorff

Walter-Wielant Wiersdorff 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 veratryl cyanide
    Patent number: 4661610
    Abstract: Veratryl cyanide is prepared by chloromethylating veratrol in solution in toluene and then reacting the resulting veratryl chloride with from 1 to 5 moles of an alkali metal cyanide, by a process in which the toluene from the chloromethylation is not removed for the reaction with cyanide, and from 3 to 25% by weight, based on veratryl chloride, of water, from 5 to 50% by weight, based on toluene, of a ketone of 3 to 6 carbon atoms and from 0.1 to 10% by weight, based on veratryl chloride, of a phase transfer catalyst are added before the reaction with cyanide.
    Type: Grant
    Filed: July 22, 1986
    Date of Patent: April 28, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: Josef Muller, Walter-Wielant Wiersdorff, Wolfram Burst, Heinz Dralle, Ernst Schaffner, Rolf Steinkamp
  • Preparation of substituted piperidines
    Patent number: 4656282
    Abstract: Piperidines substituted in the 3- and/or 4-position are prepared by reacting a glutardialdehyde substituted in the 2- and/or 3-position with ammonia or a primary amine and hydrogen at elevated temperature and under superatmospheric pressure in the presence of a hydrogenation catalyst.
    Type: Grant
    Filed: November 4, 1985
    Date of Patent: April 7, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: Walter Himmele, Walter-Wielant Wiersdorff, Marco Thyes
  • Aminopropanol derivatives of 2-hydroxy-.beta.-phenyl-propiophenones, their preparation and therapeutic agents containing these compounds
    Patent number: 4571409
    Abstract: Novel aminopropanol derivatives of 2-hydroxy-.beta.-phenyl-propiophenones and their physiologically acceptable acid addition compounds, processes for their preparation and therapeutic agents which contain these derivatives and are useful as antiarrhythmic drugs.
    Type: Grant
    Filed: May 13, 1985
    Date of Patent: February 18, 1986
    Assignee: BASF Aktiengesellschaft
    Inventors: Albrecht Franke, Josef Mueller, Helmut Lietz, Walter-Wielant Wiersdorff, Hans-Guenther Hege, Claus D. Mueller, Josef Gries, Dieter Lenke, Gerda von Philipsborn, Manfred Raschack
  • Aminopropanol derivatives of 2-hydroxy-.beta.-phenyl-propiophenones, pharmaceutical compositions and use
    Patent number: 4540697
    Abstract: Novel aminopropanol derivatives of 2-hydroxy-.beta.-phenyl-propiophenones and their physiologically acceptable acid addition compounds, processes for their preparation and therapeutic agents which contain these derivatives and are useful as antiarrhythmic drugs.
    Type: Grant
    Filed: May 23, 1984
    Date of Patent: September 10, 1985
    Assignee: BASF Aktiengesellschaft
    Inventors: Albrecht Franke, Josef Muller, Helmut Lietz, Walter-Wielant Wiersdorff, Hans-Gunther Hege, Claus D. Muller, Josef Gries, Dieter Lenke, Gerda von Philipsborn, Manfred Raschack
  • Preparation of o-acylphenols and p-acylphenols
    Patent number: 4508924
    Abstract: o-Acylphenols and p-acylphenols are prepared by reacting phenol with an acid halide and aluminum chloride, using a halobenzene as the solvent, at from 15.degree. to 55.degree. C. and then at from 55.degree. and 200.degree. C.The compounds obtainable by the process of the invention are valuable starting materials for the preparation of drugs, pesticides and dyes.
    Type: Grant
    Filed: November 1, 1983
    Date of Patent: April 2, 1985
    Assignee: BASF Aktiengesellschaft
    Inventors: Josef Mueller, Walter-Wielant Wiersdorff, Werner Kirschenlohr, Gerd Schwantje
  • Novel carbamates, their preparation, and pharmaceutical formulations containing these compounds
    Patent number: 4335138
    Abstract: Novel carbamates derived from substituted cyclic .beta.-keto-alcohols, their preparation, and pharmaceutical formulations which contain these compounds and which may be used as hypnotics in the treatment of sleep disturbance and as sedatives.
    Type: Grant
    Filed: September 15, 1980
    Date of Patent: June 15, 1982
    Assignee: BASF Aktiengesellschaft
    Inventors: Walter-Wielant Wiersdorff, Karl-Heinz Geiss, Harald Weifenbach, Wolfgang Worstmann, Dieter Lenke, Rolf Kretzschmar
  • Carbamates and their use as pharmaceuticals
    Patent number: 3965119
    Abstract: Carbamates derived from polycyclic .gamma.-hydroxylactones and their production. The compounds may be used as pharmaceuticals by virtue of their analgesic properties.
    Type: Grant
    Filed: September 13, 1974
    Date of Patent: June 22, 1976
    Assignee: BASF Aktiengesellschaft
    Inventors: August Amann, Gerhard Bolz, Walter-Wielant Wiersdorff, Hubert Giertz, Klaus Wilsmann