Patents by Inventor Claes Göran Lys{acute over (e)}n

Claes Göran Lys{acute over (e)}n 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 cellulose-containing fibre material
    Patent number: 6179958
    Abstract: A method for cooking chips, involving steaming the chips, impregnating the chips with impregnating liquid in an impregnation vessel, which impregnating liquid comprises fresh cooking liquid and spent liquor, extracting spent liquor from the impregnation vessel, cooking the impregnated chips in cooking zones including an introductory co-current cooking zone and a concluding counter-current cooking zone, extracting spent liquor from the digester at a position between the said co-current and counter-current cooking zones, transferring the said spent liquor from the digester to at least one position upstream of the digester, circulating the cooking liquid in a bottom circulation within the said counter-current cooking zone, heating the circulating cooking liquid by means of heat exchange, and supplying wash liquid to the bottom of the digester.
    Type: Grant
    Filed: July 29, 1998
    Date of Patent: January 30, 2001
    Assignee: Kvaerner Pulping AB
    Inventors: Claes Göran Lys{acute over (e)}n, Torbjörn Ulf Olsson, Gunnar Carl Wernqvist