Patents by Inventor Karl-Erik Lekander

Karl-Erik Lekander 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 for combusting a mixture of spent magnesium sulphite digestion liquor and alkaline oxygen bleach liquor
    Patent number: 4227966
    Abstract: A method for oxygen delignifying magnesium sulfite pulp is disclosed. More particularly, a method is disclosed by which the spent liquors from digestion of magnesium sulfite pulp and from alkaline oxygen bleaching of the pulp can be combined and combusted without a smelt of sodium compounds being formed during the combustion.
    Type: Grant
    Filed: March 6, 1979
    Date of Patent: October 14, 1980
    Assignee: Sunds Aktiebolag
    Inventors: Lennart Ivnas, Karl-Erik Lekander