Patents by Inventor Kjell Evert Abrahamsson

Kjell Evert Abrahamsson 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).

  • Oxygen-alkali delignification of lignocellulosic material in the presence of a manganese compound
    Patent number: 4087318
    Abstract: A process is provided for the delignification of lignocellulosic material wherein the lignocellulosic material, prior to the delignification, is treated with water or an aqueous solution to remove compounds which catalyze the degradation of carbohydrates and then the delignification is carried out with oxygen and alkali in the presence of a manganese compound to improve the selectivity of the delignification and increase the rate of delignification.
    Type: Grant
    Filed: December 27, 1976
    Date of Patent: May 2, 1978
    Assignee: Mo och Domsjo Aktiebolag
    Inventors: Hans Olof Samuelson, Kjell Evert Abrahamsson