Patents by Inventor Bernd Vierhaus

Bernd Vierhaus 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