Patents by Inventor Gunnar Carré

Gunnar Carré 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).

  • Two-stage chlorine bleaching process with filtrate recirculation
    Patent number: 7182835
    Abstract: Methods for bleaching chemical pulp are disclosed including dewatering the pulp to a concentration of from 25 to 40%, bleaching in a first chlorine dioxide stage, followed by a second alkaline bleaching stage, followed by a third chlorine dioxide bleaching stage, dewatering the bleached pulp to a concentration of from 10 to 40% and producing a filtrate, and recycling the filtrate to control the pulp concentration of the dewatered chemical pulp to from 8 to 15% in the first bleaching stage.
    Type: Grant
    Filed: August 14, 2001
    Date of Patent: February 27, 2007
    Assignee: Metso Paper, Inc.
    Inventors: Lars-Åke Lindström, Solveig Nordén, Gunnar Carré