Patents by Inventor Torolf Laxen

Torolf Laxen 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).

  • Bleaching medium consistency pulp with ozone
    Patent number: 6579411
    Abstract: A method of bleaching cellulose pulp with ozone includes pumping cellulose pulp in form of a fiber suspension having a consistency range of 5 to 25% with a high-consistency pump to a fluidizing Mixture in which oxygen and ozone containing gas is introduced and mixed into the pulp so as to generate a foam whereby the pulp fibers and the ozone used as the bleaching agent are brought to contact with each other, bleached, and the pulp is discharged from the mixer to a reaction vessel.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: June 17, 2003
    Assignee: Andritz Oy
    Inventors: Kaj Henricson, Torolf Laxen, Juhani Peltonen
  • Process for bleaching medium consistency pulp with ozone using a pressurized fluidizing mixer
    Patent number: 6547923
    Abstract: A method of bleaching cellulose pulp with ozone includes pumping cellulose pulp in form of a fiber suspension having a consistency range of 5 to 25% with a high-consistency pump to a fluidizing mixture in which oxygen and ozone containing gas is introduced and mixed into the pulp so as to generate a foam whereby the pulp fibers and the ozone used as the bleaching agent are brought to contact with each other, bleached, and the pulp is discharged from the mixer to a reaction vessel.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: April 15, 2003
    Assignee: Andritz Oy
    Inventors: Kaj Henricson, Torolf Laxen, Juhani Peltonen