Patents by Inventor Gorgen Akerlund

Gorgen Akerlund 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 process
    Publication number: 20020104627
    Abstract: A process for final bleaching cellulose-containing pulp which has been subjected to previous bleaching with a peroxide compound. The process involves the sequential steps of exposing the pulp to an amount of a reducing agent in order to eliminate residual peroxide compound from the pulp and then final bleaching the pulp by exposing the pulp to an amount of formamidine sulfinic acid.
    Type: Application
    Filed: December 4, 2000
    Publication date: August 8, 2002
    Inventors: Richard C. Denton, Gorgen Akerlund
  • Method of bleaching with formamidine sulfinic acid using a reducing agent to eliminate residual peroxide
    Patent number: 6428653
    Abstract: A process for final bleaching cellulose-containing pulp which has been subjected to previous bleaching with a peroxide compound. The process involves the sequential steps of exposing the pulp to an amount of a reducing agent in order to eliminate residual peroxide compound from the pulp and then final bleaching the pulp by exposing the pulp to an amount of formamidine sulfinic acid.
    Type: Grant
    Filed: December 4, 2000
    Date of Patent: August 6, 2002
    Assignee: West Fraser Timber Co. Ltd.
    Inventors: Richard C. Denton, Gorgen Akerlund
  • Method for controlling peroxide bleaching in a plurality of bleaching stages
    Patent number: 4878998
    Abstract: Method of peroxide bleaching of mechanical, thermomechanical and chemi-mechanical pulp wherein the peroxide bleaching is controlled by addition of a known amount of bleaching chemicals in the first stage which amount is allowed to react under defined conditions whereafter the brightness of the pulp after this first stage is used for control of a subsequent stage. In the first stage fresh chemicals, chemicals recirculated from a subsequent bleaching stage or a mixture of these is used. Hydrogen peroxide is the preferred bleaching agent but other peroxides can also be used.
    Type: Grant
    Filed: June 20, 1988
    Date of Patent: November 7, 1989
    Assignee: Eka Nobel AB
    Inventors: Jan-Erik Hook, Gorgen Akerlund