Patents by Inventor Nils Anders Lennart Wikdahl

Nils Anders Lennart Wikdahl 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).

  • Process and apparatus for the production of cellulose pulps of improved quality
    Publication number: 20020117275
    Abstract: A process and apparatus for the preparation of improved cellulose pulps is provided, in which defibered pulp is screened for removal of shives, and fibers with low bonding ability are removed in hydrocyclones, and rejects from the hydrocyclones are treated in refiner. In the process a specific combination of characteristics for the hydrocyclones and the volumetric flow is used in order to prepare pulps which give products of improved qualities, such as higher tensile strength, tear strength, light-scattering, surface smoothness, and specially low shive content.
    Type: Application
    Filed: February 11, 2002
    Publication date: August 29, 2002
    Inventor: Nils Anders Lennart Wikdahl
  • Process and apparatus for the production of cellulose pulps of improved quality
    Patent number: 6391153
    Abstract: A process and apparatus for the preparation of improved cellulose pulps is provided, in which defibered pulp is screened for removal of shives, and fibers with low bonding ability are removed in hydrocyclones, and rejects from the hydrocyclones are treated in refiner. In the process a specific combination of characteristics for the hydrocyclones and the volumetric flow is used in order to prepare pulps which give products of improved qualities, such as higher tensile strength, tear strength, light-scattering, surface smoothness, and especially low shive content.
    Type: Grant
    Filed: July 11, 2000
    Date of Patent: May 21, 2002
    Assignee: Nils Anders Lennart Wikdahl
    Inventor: Nils Anders Lennart Wikdahl
  • Hydrocyclone separator unit with downflow distribution of fluid to be fractionated and process
    Patent number: 3959123
    Abstract: A hydrocyclone separator unit is provided having an array of cyclone separators arranged in a plurality of superimposed layers, and oriented at least approximately horizontally, with common distributing and collecting chambers for liquid suspension to be fractionated and for the respective fractions obtained therefrom, and featuring downflow distribution of liquid suspension to be fractionated to the several layers of hydrocyclone separators in the array.A process also is provided for fractionation of liquid suspension in hydrocyclones arranged in superimposed layers in which the liquid proceeds at least in part by downflow to the several layers of hydrocyclones.
    Type: Grant
    Filed: August 6, 1973
    Date of Patent: May 25, 1976
    Inventor: Nils Anders Lennart Wikdahl