Patents by Inventor Sara Eriksson

Sara Eriksson 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 of bleaching a pulp
    Patent number: 8257550
    Abstract: Methods for bleaching oxygen delignified and washed pumps having a consistency of between 8 and 20% are disclosed including a first chlorine dioxide bleaching step, washing the bleached pulp, subjecting the washed pulp to an alkaline extraction step to obtain an alkali-containing pulp, adding chlorine dioxide and adjusting the pH in a second chlorine dioxide bleaching step performed directly after the alkaline extraction step without an intermediate washing step, and subjecting the bleached alkali-containing pulp to a peroxide treatment step directly after the second chlorine dioxide bleaching step or with an intermediate washing step prior to the peroxide treatment step.
    Type: Grant
    Filed: February 12, 2009
    Date of Patent: September 4, 2012
    Assignee: Metso Paper, Inc.
    Inventors: Mårten Dahl, Sara Eriksson, Solveig Nordén
  • METHOD OF BLEACHING A PULP
    Publication number: 20110036524
    Abstract: Methods for bleaching oxygen delignified and washed pumps having a consistency of between 8 and 20% are disclosed including a first chlorine dioxide bleaching step, washing the bleached pulp, subjecting the washed pulp to an alkaline extraction step to obtain an alkali-containing pulp, adding chlorine dioxide and adjusting the pH in a second chlorine dioxide bleaching step performed directly after the alkaline extraction step without an intermediate washing step, and subjecting the bleached alkali-containing pulp to a peroxide treatment step directly after the second chlorine dioxide bleaching step or with an intermediate washing step prior to the peroxide treatment step.
    Type: Application
    Filed: February 12, 2009
    Publication date: February 17, 2011
    Applicant: METSO PAPER, INC.
    Inventors: Mårten Dahl, Sara Eriksson, Solveig Nordén