Patents by Inventor Thomas Christopher Greschik

Thomas Christopher Greschik 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).

  • Bleaching of pulp
    Patent number: 8920603
    Abstract: The present invention relates to a process of bleaching pulp derived from an alkaline pulping process having a hexenuronic acid content prior to the final bleaching stage from about 1 to about 80 mmol/kg dry pulp, said process comprising three chlorine dioxide stages D0, D1, and D2, wherein the chlorine dioxide charges based on the total chlorine dioxide charge in a) D0 is from about 40 to about 60%; b) D1 is from about 30 to about 55%; c) D2 is from about 4 to about 20%, and wherein the final chlorine dioxide stage D2 is performed at a pH from about 2 to about 4.5. The invention also relates to a bleached pulp obtainable by the process.
    Type: Grant
    Filed: October 10, 2007
    Date of Patent: December 30, 2014
    Assignee: Akzo Nobel N.V.
    Inventors: Magnus Björklund, Thomas Christopher Greschik, Håkan Fägersten
  • Treatment of pulp
    Patent number: 8728274
    Abstract: The present invention relates to a method of treating an aqueous suspension of bleached pulp derived from an alkaline pulping process comprising dewatering and drying said suspension, wherein the pH of the suspension to be treated ranges from about 6.5 to about 12.
    Type: Grant
    Filed: August 30, 2007
    Date of Patent: May 20, 2014
    Assignee: Akzo Nobel N.V.
    Inventors: Thomas Christopher Greschik, Hans Johansson-Vestin, Håkan Fägersten
  • Method of treating cellulose fibres with chlorine dioxide and an alkyl cellulose derivative
    Patent number: 8007636
    Abstract: The present invention relates to methods of modifying cellulose fibers and of producing paper which methods include providing a pulp suspension of cellulose fibers and adding a cellulose derivative during the bleaching of the cellulose fibers in an acidic bleaching stage.
    Type: Grant
    Filed: September 29, 2005
    Date of Patent: August 30, 2011
    Assignee: Akzo Nobel N.V.
    Inventors: Thomas Christopher Greschik, Jan Nordin, Hans-Ake Baltsen
  • TREATMENT OF PULP
    Publication number: 20080073043
    Abstract: The present invention relates to a method of treating an aqueous suspension of bleached pulp derived from an alkaline pulping process comprising dewatering and drying said suspension, wherein the pH of the suspension to be treated ranges from about 6.5 to about 12.
    Type: Application
    Filed: August 30, 2007
    Publication date: March 27, 2008
    Applicant: AKZO NOBEL N.V.
    Inventors: Thomas Christopher Greschik, Hans Johansson-Vestin, Hakan Fagersten