Patents by Inventor Rune Hillstrom

Rune Hillstrom 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).

  • Patent number: 5034128
    Abstract: An apparatus for dewatering a pulp is described, comprising a vessel having a pulp chamber for pulp to be dewatered; a pulp inlet to the vessle; pulp outlet from the vessel; a filtrate chamber with an outlet for filtrate expelled from the pulp; a stationary cylindrical screen mounted within the vessel and defining said plup chamber and filtrate chamber on opposite sides thereof; and mechanical cleaning means supported by a shaft and disposed in the pulp chamber close to the screen face of the screen for removing a mat of pulp therefrom. The apparatus further comprises a backflushing means mounted outside the vessel and including a cylinder with first and second end portions and a piston mounted within the cylinder for reciprocal movement therein. The first end portion communicates with the interior of the apparatus, and the second end portion communicates with the filtrate chamber.
    Type: Grant
    Filed: June 21, 1990
    Date of Patent: July 23, 1991
    Assignee: Kamyr Aktiebolag
    Inventors: Rune Hillstrom, Finn Jacobsen, Joseph R. Phillips
  • Patent number: 4961844
    Abstract: A suspension of fibrous cellulose pulp is separated into at least two portions in an apparatus comprising a closed housing having inlet and outlets, and a rotor means provided with projections, said rotor means comprising a first rotor part surrounded by a screening means, the first rotor part and the screening means in their axial extension forming a screening zone and being arranged to cooperate with each other during rotation of the first rotor part for screening the suspension in a fluidized state. The rotor means comprises a second rotor part located immediately adjacent to the first rotor part, a rigid, water-impervious wall member surrounding the second rotor part.
    Type: Grant
    Filed: March 28, 1989
    Date of Patent: October 9, 1990
    Assignee: Kamyr AB
    Inventors: Rolf Ekholm, Rune Hillstrom, Daniel Palsson
  • Patent number: 4913806
    Abstract: An apparatus for screening a suspension of fibrous cellulose pulp is described which comprises a housing and a rotor shaft, the housing having an inject section, first and second screening sections, each of which comprising rotor members mounted on the rotor shaft and a cylindrical screening plate cooperating therewith and defining an outer accept chamber and an inner screening chamber, and a reject section for the removal of fiber suspension remaining at screening, the inject section communicating with the screening chamber of the first screening section. According to the invention the inject section is disposed between the first screening section and the second screening section, and the screening chamber of the first screening section communicates with the adjacent reject section.
    Type: Grant
    Filed: June 5, 1989
    Date of Patent: April 3, 1990
    Assignee: Kamyr AB
    Inventors: Rune Hillstrom, Rolf Ekholm
  • Patent number: 4895619
    Abstract: A method of delignification of cellulosic fiber material is described. The pulp containing said cellulosic fiber material is fed in a main line containing a main reactor in which the pulp is treated with oxygen. The pulp is screened at at lest one point in the main line, and the screen reject obtained is fed in a branch line containing at least one secondary reactor for separate treatment with oxygen. According to the invention the separate treatment with oxygen is carried out without previous refining, and the screen reject thus separately treated in said branch line is returned to the main line at a point upstream of said main reactor.
    Type: Grant
    Filed: January 30, 1989
    Date of Patent: January 23, 1990
    Assignee: Kamyr AB
    Inventors: Bjorn Ahs, Rune Hillstrom