Patents by Inventor Ryham, Rolf

Ryham, Rolf 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 and apparatus for evaporating waste liquor produced when cooking fibrous material containing cellulose
    Patent number: 4944840
    Abstract: The present invention relates to a method and apparatus for evaporating waste liquor produced when cooking fibrous material containing cellulose in a continuous pulp digester. In the continuous cooking process, fibrous material is heated to the process temperature by direct or indirect vapor heating in the digester at an increased pressure. The invention especially relates to digesters, in which fibrous material is heated directly with vapor.
    Type: Grant
    Filed: January 11, 1989
    Date of Patent: July 31, 1990
    Assignee: Ahlstromforetagen Svenska AB
    Inventors: Kaj Henricson, Ryham, Rolf, Sannholm, Krister