Patents by Inventor Magnus Wretborn

Magnus Wretborn 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).

  • Method for purifying process water or wastewater containing wood resin
    Patent number: 5354479
    Abstract: Wood-resin-containing process water or wastewater from the pulp industry is purified by adding, as flocculants, a high-molecular-weight polyethylene oxide and a water-soluble, non-ionic cellulose ether, suitably having a flocculation temperature of 35.degree.-80.degree. C. The added amount per liter of water is preferably 2-20 mg of the high-molecular-weight polyethylene oxide and preferably 5-30 mg of the non-ionic cellulose ether.
    Type: Grant
    Filed: April 30, 1993
    Date of Patent: October 11, 1994
    Assignee: EKA Nobel AB
    Inventors: Magnus Wretborn, Arne Andersson, Gunnar Goransson