Patents by Inventor Karl B. Pettersson

Karl B. Pettersson 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 covering the chemical losses in pulp production
    Patent number: 4533433
    Abstract: A method for keeping the heating surfaces in the final thickener (VI), which is divided into several sections (A,B,C), clean in evaporating waste liquors in pulping processes for recovering the cooking chemicals. Chemical solutions e.g. residual products from other processes as tall oil separation and chlorine dioxide production are added to cover the chemical losses. According to the invention the chemical solutions are supplied to those sections of the final thickener which are at the time not being washed with thick waste liquor from the preceding evaporator (II).
    Type: Grant
    Filed: March 8, 1984
    Date of Patent: August 6, 1985
    Assignee: A. Ahlstrom Osakeyhtio
    Inventor: Karl B. Pettersson