Patents by Inventor Wernfried Riechmann

Wernfried Riechmann 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: 4104304
    Abstract: Production of methyldichlorophosphane. The compound is made by reacting methane and phosphorus trichloride in a reaction zone in which a temperature higher than C is maintained. More specifically, hot reaction gas coming from the reaction zone is mechanically freed from solid matter, and the reaction gas freed from solid matter is passed to a quenching zone in which it is quenched with liquefied reaction mixture having 0.3 to 5 weight % of an organic barium compound or a non-ionic surfactant dissolved therein.
    Type: Grant
    Filed: July 11, 1977
    Date of Patent: August 1, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Stefan Schafer, Klaus Gehrmann, Alexander Ohorodnik, Karl-Heinz Steil, Wernfried Riechmann, Friedhelm Bylsma
  • Patent number: 4032410
    Abstract: A distillation column comprising a shell which has serially arranged therein a plurality of distilling trays with respective liquid inlets and outlets. An annular slit of substantially uniform width is left between the individual trays and the shell. The slit may be interrupted by a plurality of spacers which bear against the inner surface of the shell, and the spacers are provided around the periphery of the individual trays.
    Type: Grant
    Filed: April 20, 1976
    Date of Patent: June 28, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Bernhard Kuxdorf, Herbert Pusche, Heinz Erpenbach, Wernfried Riechmann
  • Patent number: 4016048
    Abstract: 2,5 DIOXO-1-OXA-2-PHOSPHOLANES OF THE GENERAL FORMULA: ##STR1## in which R.sup.1 stands for an alkyl radical having from 1 to 4 carbon atoms, or a phenyl radical, and R.sup.2 and R.sup.3 each stand for hydrogen or CH.sub.3, are distillatively purified. To this end the respective crude compound is preheated to to C and fed to the head of a distilling column provided with a plurality of individually heatable trays maintained at temperatures increasing from the upper-most tray to the lowermost, the uppermost tray in the column being maintained at to C and the lowermost tray being maintained at to C, the pressure at the head of the column being 20 to 200 mm Hg, preferably 50 to 120 mm Hg; an inert gas preheated to to
    Type: Grant
    Filed: July 13, 1976
    Date of Patent: April 5, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Klaus Gehrmann, Alexander Ohorodnik, Elmar Lohmar, Wernfried Riechmann