Patents by Inventor Matts Sundin

Matts Sundin 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).

  • Oxygen delignification of pulp in two stages
    Publication number: 20010050152
    Abstract: Methods for oxygen delignification of chemical pulps are disclosed including contacting the chemical pulp with oxygen first in an upstream reactor vessel and then in a downstream reactor vessel. The upstream reactor vessel is maintained at pressures of greater than about 3 bar, and the downstream reactor vessel is maintained at temperatures of between about 90 and 120° C. and corresponding predetermined pressures. Heating of the partially delignified chemical pulp between the upstream and downstream reactors is accomplished by contacting the partially delignified chemical pulp with low pressure steam.
    Type: Application
    Filed: February 12, 2001
    Publication date: December 13, 2001
    Inventors: Kjell Forslund, Rune Larsson, Matts Sundin, Monica Bokstrom
  • Oxygen delignification of pulp in two stages with low pressure steam heating between stages
    Patent number: 6221207
    Abstract: Methods for oxygen delignification of chemical pulps are disclosed including contacting the chemical pulp with oxygen first in an upstream reactor vessel and then in a downstream reactor vessel. The upstream reactor vessel is maintained at pressures of greater than about 3 bar, and the downstream reactor vessel is maintained at temperatures of between about 90 and 120° C. and corresponding predetermined pressures. Heating of the partially delignified chemical pulp between the upstream and downstream reactors is accomplished by contacting the partially delignified chemical pulp with low pressure steam.
    Type: Grant
    Filed: September 22, 1998
    Date of Patent: April 24, 2001
    Assignee: Valmet Fibertech Aktiebolag
    Inventors: Kjell Forslund, Rune Larsson, Matts Sundin, Monica Bokström