Patents by Inventor Johanna Svanberg

Johanna Svanberg 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).

  • Digester having screening arrangement for isothermal cooking of fibrous material
    Patent number: 6113742
    Abstract: The present invention relates to a digester for continuous cooking under raised pressure and temperature of fibre material in a vertical digester (1), 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 the digester (1) is fitted with an additional digester screening arrangement (2) above the lowest screening arrangement (1B) of the digester so that the temperature in all the participatory cooking zones in the digester can be kept at essentially the same temperature level.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: September 5, 2000
    Assignee: Kvaerner Pulping AB
    Inventors: Ake Backlund, Johanna Svanberg
  • Method of continuously isothermally cooking of pulp
    Patent number: 5919337
    Abstract: The present invention relates to a digester for continuous cooking, under elevated pressure and temperature, of fibre material in a vertical digester (1), where fibre material and cooking liquid are fed into the top of the digester, used cooking liquor is drawn off from at least one digester screen arrangement (1D) between the top and the bottom of the digester, and fibre material is fed out from the bottom of the digester, it being possible to maintain the temperature in the cooking zone immediately above the digester screen arrangement (1B) at essentially the same temperature level as the remaining cooking zone or cooking zones of the digester.
    Type: Grant
    Filed: May 18, 1995
    Date of Patent: July 6, 1999
    Assignee: Kvaerner Pulping Technologies AB
    Inventors: Sven-Erik Olsson, Stig Andtbacka, Finn Jacobsen, .ANG.ke Backlund, Johanna Svanberg
  • 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
  • Process for isothermal cooking pulp in a continuous digester
    Patent number: 5766413
    Abstract: The present invention relates to a digester for continuous cooking under raised pressure and temperature of fibre material in a vertical digester (1), 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 the digester (1) is fitted with an additional digester screening arrangement (2) located at less than about 1.5 meters above the lowest screening arrangement (1B) of the digester so that the temperature in all the participatory cooking zones in the digester can be kept at essentially the same temperature level.
    Type: Grant
    Filed: August 13, 1996
    Date of Patent: June 16, 1998
    Assignee: Kvaerner Pulping AB
    Inventors: Ake Backlund, Johanna Svanberg
  • Process for operating a digester
    Patent number: 5591303
    Abstract: In a pulp digester for continuous cooking under raised pressure and temperature of fiber material in a vertical digester (1), 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, and at least one screening arrangement (2) in the lower half 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 of angular shape, preferably rectangular, most preferred square, having a screen face (3A) of which the total area is less than 1 m.sup.
    Type: Grant
    Filed: March 22, 1995
    Date of Patent: January 7, 1997
    Assignee: Kvaerner Pulping Technologies AB
    Inventors: Finn Oulie, Ake Backlund, Johanna Svanberg
  • 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
  • Digester for cooking pulp having staggered screens
    Patent number: 5470437
    Abstract: In a pulp digester for continuous cooking under raised pressure and temperature of fiber material in a vertical digester (1), 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, and at least one screening arrangement (2) in the lower half 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 of angular shape, preferably rectangular, most preferred square, having a screen face (3A) of which the total area is less than 1 m.sup.
    Type: Grant
    Filed: July 16, 1993
    Date of Patent: November 28, 1995
    Assignee: Kvaerner Pulping Technologies AB
    Inventors: Finn Oulie, Ake Backlund, Johanna Svanberg