Patents by Inventor Hans-Erik Rye Engstrom

Hans-Erik Rye Engstrom 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).

  • Countercurrently bleaching high consistency cellulose pulp with oxygen
    Patent number: 4022654
    Abstract: Finely disintegrated and fluffed cellulose pulp, at a consistency of 25-35%, is introduced into the top of a reaction tower and countercurrently bleached with oxygen gas, introduced into the lower portion of the tower, at a temperature of 80.degree.-120.degree. C. The pulp is maintained in the tower as a gas permeable column having a maximum height, in meters, equal to five tenths of the pulp consistency.
    Type: Grant
    Filed: April 9, 1975
    Date of Patent: May 10, 1977
    Assignee: Sunds Aktiebolag
    Inventors: Hans-Erik Rye Engstrom, Bengt Edvard Pettersson