Patents by Inventor Kenneth Bellstrom

Kenneth Bellstrom 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).

  • Screen system for a continuous digester
    Patent number: 5827401
    Abstract: A screen system for a digester for continuous cooking under raised pressure and temperature of fiber material in a vertical vessel, where input of fiber material and cooking liquid takes place at the top of the digester, withdrawal of spent cooking liquor is carried out from at least one digester screening arrangement (1D) between the top and the bottom of the digester, and fiber material is fed out from the bottom (1C) of the digester, wherein at least one of said screening arrangements (1, 2) has at least one screen element (2A) of which the main configuration is circular and which is assembled by means of welding, and which is fitted into the digester shell by means of welding.
    Type: Grant
    Filed: January 16, 1997
    Date of Patent: October 27, 1998
    Assignee: Kvaerner Pulping Technologies AB
    Inventors: Ake Backlund, Kenneth Bellstrom, Finn Oulie, Johanna Svanberg, Soren Soderqvist
  • Digester for cooking pulp having staggered circular screens for isothermal cooking
    Patent number: 5567280
    Abstract: A screen system for a digester for continuous cooking under raised pressure and temperature of fibre material in a vertical vessel, where input of fibre material and cooking liquid takes place at the top of the digester, withdrawal of spent cooking liquor is carried out from at least one digester screening arrangement (1D) between the top and the bottom of the digester, and fibre material is fed out from the bottom (1C) of the digester, wherein at least one of said screening arrangements (1, 2) has at least one screen element (2A) of which the main configuration is circular and which is assembled by means of welding, and which is fitted into the digester shell by means of welding.
    Type: Grant
    Filed: March 31, 1995
    Date of Patent: October 22, 1996
    Assignee: Kvaerner Pulping Aktiebolag
    Inventors: Ake Backlund, Kenneth Bellstrom, Finn Oulie, Johanna Svanberg, Soren Soderqvist