Patents by Inventor Nils J. C. Hartler

Nils J. C. Hartler 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
  • Method of increasing cellulosic pulp yields in an alkaline digestion process
    Patent number: 3937647
    Abstract: Increased pulp yields are obtained by alkaline digestion of cellulosic material until a pulp yield of not above 65% is obtained, lowering the pH of the digestion liquid is lowered to allow 11 causing organic substances to precipitate from the digestion liquor and then continuing digestion in the presence of the pulp until at least 5% of the organic substances which have been precipitated out are absorbed by the pulp.
    Type: Grant
    Filed: November 12, 1973
    Date of Patent: February 10, 1976
    Assignee: Svenska Traforskningsinstitutet
    Inventors: Inga L. Backstrom, Nils J. C. Hartler, Knut P. Kringstad