Patents by Inventor Werner Dostler

Werner Dostler 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).

  • Process for the recovery of mixtures of chlorotetrafluoroethane and octafluorocyclobutane
    Patent number: 5129997
    Abstract: A process for the preparation of mixtures of chlorotetrafluoroethane and octafluorocyclobutane from the gas stream from the pyrolysis of chlorodifluoromethane at temperatures above 600.degree. C. is described in which the principal constituents tetrafluoroethylene and hexafluoropropylene as well as hydrogen chloride are removed in advance. The mixtures are obtained by withdrawal as a side fraction during the rectifying distillation of the residue remaining, a clean separation of the perfluorocyclobutenes advantageously taking place. The mixtures are used for obtaining hexafluoropropylene by pyrolysis.
    Type: Grant
    Filed: April 10, 1991
    Date of Patent: July 14, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Thomas Schottle, Herbert Weber, Werner Dostler, Karl Rettenbeck