Patents by Inventor Gunnar Carre

Gunnar Carre 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
  • Two-stage chlorine bleaching process with filtrate recirculation
    Publication number: 20030178163
    Abstract: A method of bleaching chemical pulp, comprising two bleaching stages (D0 and, respectively, D1) with chlorine dioxide as dominating bleaching chemical and at least one intermediate alkaline bleaching stage (E). The ingoing pulp is dewatered to a concentration of 25-40% before the first chlorine dioxide stage (D0) and to 10-40% after the second chlorine dioxide stage (D1). Filtrate from the dewatering after the second chlorine dioxide stage (D1) is re-cycled and utilized for controlling the pulp concentration to 8-15% of the dewatered pulp to the first chlorine dioxide stage (D0).
    Type: Application
    Filed: February 12, 2003
    Publication date: September 25, 2003
    Inventors: Lars-Ake Lindstrom, Solveig Norden, Gunnar Carre