Patents Assigned to Lennart Wallen & Co AB
  • Dewatering and homogenizing apparatus
    Patent number: 3943034
    Abstract: Dewatering and homogenizing apparatus comprising a screw thickener at the discharge end provided with a plug forming means actuated by pulling means. At the thickener's discharge end there is also mounted a hood for receiving dewatered pulp and with supply means for homogenizing agent.
    Type: Grant
    Filed: April 5, 1974
    Date of Patent: March 9, 1976
    Assignee: Lennart Wallen & Co AB
    Inventor: Lennart E. O. Wallen
  • Screw thickener
    Patent number: 3943033
    Abstract: A screw thickener to be used for dewatering fibrous materials and being provided with a stuffing means at the discharge end. Said screw thickener having a hydrostatic superpressure of at least 10 kPa and said stuffing means being actuated by pulling means.
    Type: Grant
    Filed: April 5, 1974
    Date of Patent: March 9, 1976
    Assignee: Lennart Wallen & Co AB
    Inventor: Lennart E. O. Wallen