Patents by Inventor Klaus Bevers

Klaus Bevers 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 production of a polyphenylene ether protected from molecular weight degradation
    Patent number: 4746723
    Abstract: A process for the production of a polyphenylene ether by quenching a transition metal catalyzed oxidative coupling reaction of a di-ortho-substituted phenol, and separation of the metal component. The process comprises:(1) removing the oxygen required for the coupling reaction,(2) contacting the reaction solution with hydrogen sulfide, a solution containing sulfide ions or a mixture thereof, and(3) separating the resulting precipitate.
    Type: Grant
    Filed: May 13, 1985
    Date of Patent: May 24, 1988
    Assignee: Chemische Werk Huls Aktiengesellschaft
    Inventors: Martin Bartmann, Klaus Burzin, Klaus Bevers