Patents by Inventor Lennart Ivnas

Lennart Ivnas 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 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