Patents Assigned to AB Tellusond
  • Method and device for examining pulp for the presence of shives
    Patent number: 4066492
    Abstract: In a method for examining pulp for the presence of shives therein a suspension of the pulp is passed through a measuring duct with transparent walls and at least one beam of light having a wavelength within the intra-red range from 750 to 950 nm is directed through the measuring duct perpendicularly to the direction of flow of the pulp suspension therein. The intensity of the light beam after its passage through the measuring duct is measured by means of a photo detector and the output signal of the photo detector is analyzed with respect to amplitude variations therein. The measurement is independent and insensitive to the type of pulp.
    Type: Grant
    Filed: May 12, 1976
    Date of Patent: January 3, 1978
    Assignee: AB Tellusond
    Inventor: Jan Hill
  • Method and device for examining pulp for the presence of shives
    Patent number: 4037966
    Abstract: In a method for examining pulp for shives present therein a suspension of the pulp is passed through a measuring duct with transparent walls and two mutually perpendicular light beams are directed through the measuring duct in a plane perpendicular to the direction of flow in the measuring duct. The intensities of the light beams after their passage through the measuring duct are measured by means of two photo detectors and the output signals of the photo detectors are multiplied to provide a combined signal representing the product of the output signals of the photo detectors. This combined signal is analyzed with respect to the temporary amplitude reductions occurring therein due to the presence of shives in the pulp suspension flow passing through the measuring duct. Preferably, the light beams consist of light having a wavelength within the infra-red range.
    Type: Grant
    Filed: May 12, 1976
    Date of Patent: July 26, 1977
    Assignee: AB Tellusond
    Inventor: Jan Hill
  • Apparatus for continuous liquid-liquid extraction of water with a solvent
    Patent number: 3996140
    Abstract: An apparatus for extracting dissolved substances from water by means of a solvent comprises an extraction vessel, a mixing container, open at the top, in the lower portion the extraction vessel, and stirring means in said mixing container. The extraction vessel contains a desired quantity of solvent. The water is added in a continuous flow and is mixed with the solvent. The lighter solvent phase rises to the top of the apparatus, while the heavier water phase is continuously withdrawn through an annular space between the mixing container and the wall of the extraction vessel.
    Type: Grant
    Filed: February 7, 1975
    Date of Patent: December 7, 1976
    Assignee: AB Tellusond
    Inventors: Bjorn Olof Josefsson, Martin Ahnoff