Patents by Inventor Klaus Stemmer

Klaus Stemmer 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 and polycondensation apparatus for the treatment of contaminated ethylene glycol
    Patent number: 5635590
    Abstract: The invention relates to a process for the treatment of contaminated ethylene glycol resulting during a polycondensation process for the production of polyester. In the course of this polycondensation process contaminated ethylene glycol is continuously predistilled, subjected as a distillation residue to secondary distillation, condensed and then returned to the polycondensation process as decontaminated ethylene glycol, so that an in-line recovery is achieved, which makes superfluous an external distillation installation for the treatment of contaminated ethylene glycol.
    Type: Grant
    Filed: August 10, 1995
    Date of Patent: June 3, 1997
    Assignee: John Brown Deutsche Engineering GmbH
    Inventors: Jurgen Rink, Klaus Stemmer, Rudolf Geier