Patents by Inventor Hans-Olof Thoresson

Hans-Olof Thoresson 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).

  • Papermaking process
    Patent number: 4961825
    Abstract: In the production of paper or pulp sheets from a paper stock, a binder is added which comprises cationic and anionic components to improve the paper characteristics and the stock characteristics, such that increased retention and a more readily dewatered stock are obtained.The anionic component consists of colloidal anionic particles having at least one surface layer of aluminum silicate or aluminum-modified silicic acid, such that the surface groups of the particles contain silicium and aluminum atoms in a ratio of from 9.5:0.5 to 7.5:2.5.The cationic component consists of cationic carbohydrate having a degree of substitution of 0.01-1.0.
    Type: Grant
    Filed: September 22, 1989
    Date of Patent: October 9, 1990
    Assignee: Eka Nobel AB
    Inventors: Kjell R. Andersson, Bernt Larsson, Hans-Olof Thoresson, Bo V. Larsson