Patents by Inventor Norbert Meindl

Norbert Meindl 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 delignification of cellulose with oxygen
    Patent number: 4834837
    Abstract: Method and apparatus for delignifying chemical pulp by means of oxygen, in which an aqueous slurry of chemical pulp is formed, then mixed with a caustic agent, followed by contact with a delignifying fluid. Water is drained off the slurry without reduction of pressure and while maintaining temperature following which the resulting slurry is maintained under these temperature and pressure conditions for a discrete period of time. The thus-obtained treated slurry is then washed.
    Type: Grant
    Filed: July 22, 1987
    Date of Patent: May 30, 1989
    Assignees: Waagner-Biro Aktiengessellschaft, Steyrermuhl Papierfabriks-und-Verlags-Aktiengesellschaft
    Inventors: Heinz Loquenz, Siegfried Meissl, Helmut Schweiger, Norbert Meindl, Karl Schwarzl, Anton Hruschka