Patents by Inventor Wolfgang Bergins

Wolfgang Bergins 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).

  • Obtaining anthracene and carbazole by melt-crystallization
    Publication number: 20040068155
    Abstract: In a method for obtaining anthracene and carbazole and their sequential products from the anthracene oil resulting during coal tar distillation or its purification products, anthracene oil or the purification product crude anthracene is converted into a melt without adding solvent, the melt is cooled under the crystallization point of carbazole and anthracene, the crystal product obtained is separated from the liquid phase, and the crystal product is distilled to obtain pure anthracene and pure carbazole.
    Type: Application
    Filed: November 12, 2003
    Publication date: April 8, 2004
    Inventors: Thomas Buttner, Ulrich Knips, Konrad Stolzenberg, J?ouml;rg Talbiersky, Edgar Fuhrmann, Friedhelm Alsmeier, Wolfgang Bergins, Siegfried Giertler, Dietmar Scholl, Bernd Vierhaus, Klaus Dialer, Rudolf Bischof, Ali Nikzad
  • Process for preparing 3,5-dimethylphenol
    Patent number: 5969196
    Abstract: For the preparation of 3,5-dimethylphenol by catalytic demethylation of isophorone in the gas phase in the presence of a metal or a metal alloy as catalyst, an isophorone-containing process stream is guided through reaction zones that contain said catalyst, whereby the reactivity of the catalyst varies in the reaction zones and the process stream between these reaction zones is thermostated in zones that do nor contain any catalyst, whereby the residual isophorone is greatly reduced, and the yield of 3,5-dimethylphenol is increased.
    Type: Grant
    Filed: April 27, 1998
    Date of Patent: October 19, 1999
    Assignee: Rutgers VFT AG
    Inventors: Wolfgang Bergins, Jorg Talbiersky
  • Novel purification process
    Patent number: 4992599
    Abstract: Crude phenol and also individual phenol fractions from tars or the hydrogenation of coal are purified from contaminating organic bases and sulfur compounds by treating the phenols with phthalic acid anhydride and optionally a quinone and distillation.
    Type: Grant
    Filed: December 13, 1989
    Date of Patent: February 12, 1991
    Assignee: Rutgerswerke AG
    Inventors: Jorg Talbiersky, Bernhard Wefringhaus, Konrad Stolzenberg, Wolfgang Bergins