Patents by Inventor Christer Sandberg

Christer Sandberg 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).

  • METHOD OF PROVIDING A PAPER FIBRE COMPOSITION
    Publication number: 20200318287
    Abstract: The present invention relates to a method of production of a paper fibre composition, comprising the steps of: a) Providing a vessel, b) Providing Na2S03 in the range of 12-122 kg/bdt combined with NaOH in the range of 0-97 kg/bdt, or NaHSO3 in the range of 10-100 kg/bdt combined with NaOH in the range of 10-100 kg/bdt to said vessel, c) Providing wood, preferably softwood chips to said vessel for pre-treatment, d) Providing heat and pressure to said vessel in order be able control the vessel to have a temperature T comprised in the range of 160° C.-184° C.
    Type: Application
    Filed: May 17, 2017
    Publication date: October 8, 2020
    Inventors: Jan Christer SANDBERG, Eva Birgitta SVENSSON RUNDLÖF, Claes Jonas Fredrik JOHNSSON, Erik Lennart Peter NELSSON
  • Method for selective removal of ray cells from cellulose pulp
    Publication number: 20070023329
    Abstract: The content of ray cells in cellulose pulp causes problems and therefore these ray cells should be removed from the cellulose pulp to improve the pulp quality. The present invention makes this possible and comprises a method wherein at first an advancing pulp suspension is screened or vortex cleaned, (3) leading to the formation of an accept pulp fraction (4) and a reject pulp fraction (5) and that the reject pulp fraction is cleaned and divided, and that accepted material (pulp fibres and valuable fine material) is brought to further treatment and/or use.
    Type: Application
    Filed: April 28, 2004
    Publication date: February 1, 2007
    Applicant: HOLMEN AKTIEBOLAG
    Inventors: Christer Sandberg, Carl Nilsson, Per Engstrand
  • Method of producing bleached thermomechanical pulp (tmp) or bleached chemithermomechanical pulp (ctmp)
    Publication number: 20040231811
    Abstract: There is a need for a cheaper method of producing bleached TMP and CTMP without impairing the properties of the pulp.
    Type: Application
    Filed: June 21, 2004
    Publication date: November 25, 2004
    Inventors: Per Engstrand, Christer Sandberg, Charlotte Wancke-Stahl, Jonas Jonsson, Goran Starck, Mikael Wahlgren