Patents by Inventor Krister Karl Erik Olsson

Krister Karl Erik Olsson 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 continuous cooking of lignocellulosic fiber material
    Patent number: 6468390
    Abstract: A method for continuous cooking of lignocellulosic fiber material, comprising the steps of sequentially (a) in a first stage, impregnating the fiber material in an impregnation liquid comprising alkali metal hydroxide, and thereafter withdrawing (14, 514) a spent impregnation liquid; (b) in a second stage, cooking the fiber material in a cooking liquor comprising alkali metal hydroxide; and (c) in a third stage, adding (A), to said fiber material, a liquid which is rich in hemicellulose, said liquid preferably comprising at least a part (14a, 514a) of said withdrawn spent impregnation liquid. In a fourth stage (d), the fiber material is cooked in a cooking liquor comprising the liquid added in the third stage, whereby the fiber material is subjected to a retention time of at least 1 hour in said fourth stage.
    Type: Grant
    Filed: August 24, 1998
    Date of Patent: October 22, 2002
    Assignee: Kvaerner Pulping AB
    Inventors: Vidar Martin Snekkenes, Krister Karl Erik Olsson, Bror Lennart Gustavsson, Ernst Mikael Lindström