Patents by Inventor Per J. Mjoberg

Per J. Mjoberg 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 making sulphate pulp
    Patent number: 4690731
    Abstract: A modified batch cooking technique for making sulfate pulp with a high degree of delignification or with a normal degree of delignification but with increased pulp viscosity. This is effected by one or several displacements of the liquor in the digester with liquor of the same temperature as the cooking liquor but with a lower lignin content.
    Type: Grant
    Filed: October 4, 1985
    Date of Patent: September 1, 1987
    Assignee: Sunds Defibrator Aktiebolag
    Inventors: Nils J. C. Hartler, Karl-Erik Lekander, Lars T. Sjodin, Per J. Mjoberg