Patents by Inventor Kjell E. Abrahamsson

Kjell E. 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).

  • Alkaline oxygen delignification and bleaching of cellulose pulp in the presence of aromatic diamines
    Patent number: 4372811
    Abstract: A process is provided for the alkaline oxygen delignification and bleaching of chemical cellulose pulp while inhibiting degradation of carbohydrates in the pulp, due to the presence of one or more aromatic diamines, preferably having the diamine groups directly linked to an aromatic ring.
    Type: Grant
    Filed: May 4, 1981
    Date of Patent: February 8, 1983
    Assignee: Mo och Domsjo Aktiebolag
    Inventors: Hans O. Samuelson, Kjell E. Abrahamsson