Patents by Inventor Robert G. Norris

Robert G. Norris 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).

  • Solvent recovery in pulp bleaching with ozone
    Patent number: 5507913
    Abstract: A process for bleaching pulp by impregnating the pulp with an aqueous organic solvent medium and then bleaching in an ozone stage (Z stage) to form a bleached pulp characterized in that organic solvent in the organic solvent medium accompanying the pulp through the ozone stage is neutralized and stripped from the bleached pulp leaving the ozone stage and the separated organic solvent is recovered for reuse.
    Type: Grant
    Filed: December 5, 1994
    Date of Patent: April 16, 1996
    Assignee: MacMillan Bloedel Limited
    Inventors: Thomas H. Murphy, Robert G. Norris