Patents by Inventor Kenneth Kjellström

Kenneth Kjellström 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).

  • Process for upgrading of thermomechanical pulp to higher quality pulp
    Patent number: 6361650
    Abstract: Processes are disclosed for processing low consistency newsprint pulp including refining the pulp in a first refiner to a consistency of greater than 2%, screening the processed pulp with a slotted screen basket with a slot width of from 0.05 to 0.15 mm, with the withdrawal of the primary reject portion being greater than 50%, withdrawing the accept portion for further processing, dewatering the reject portion to provide a high consistency pulp, refining the high consistency pulp in a second refiner, screening the processed high width consistency pulp with a slotted screen basket having a slot of less than 0.15 mm, and combining the two accept portions for the further processing steps.
    Type: Grant
    Filed: August 21, 2001
    Date of Patent: March 26, 2002
    Assignee: Valmet Fibertech AB
    Inventors: Ove Danielsson, Bo Falk, Ulf Karlsson, Kenneth Kjellström