Patents by Inventor Rolf G. Ekholm

Rolf G. Ekholm 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 bleaching of cellulosic pulp
    Patent number: 3976538
    Abstract: A first portion of bleaching liquid is passed through cellulosic pulp in a bleaching zone at a first level with respect to the pulp feed direction and withdrawn through transversely spaced strainer means located at about said first level so that the passage of the first portion of bleaching liquid through the pulp is in a direction transverse to the feed direction of the pulp and a second portion of bleaching liquid is passed through said cellulosic pulp at a second level with respect to the pulp feed direction and withdrawn through transversely spaced strainer means located at about the second level so that the passage of the second portion of bleaching liquid through the pulp is in a direction transverse to the feed direction of the pulp and opposite from the transverse direction through said first level.
    Type: Grant
    Filed: February 24, 1976
    Date of Patent: August 24, 1976
    Assignee: Kamyr Aktiebolag
    Inventors: Johan E. Gullichsen, Rolf G. Ekholm