Patents by Inventor Marcel Robberechts

Marcel Robberechts 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).

  • Process for bleaching a chemical paper pulp in an oxygen-peroxymonosulfuric acid-hydrogen peroxide sequence
    Patent number: 5698075
    Abstract: A process for bleaching a chemical paper pulp, including, in the order recited, subjecting the chemical paper pulp to treatment with oxygen in a preliminary delignification stage which does not employ chlorine in an acidic medium or a combination of chlorine and chlorine dioxide in an acidic medium; subjecting the chemical paper pulp to treatment with peroxymonosulphuric acid in a peroxymonosulphuric acid stage carried out at a temperature ranging between 75.degree. and 100.degree. C. for a period ranging between 70 and 150 minutes and at a pulp consistency of ranging between 12 and 25% of dry matter; and subjecting the chemical paper pulp to treatment with alkaline hydrogen peroxide in an alkaline hydrogen peroxide stage.
    Type: Grant
    Filed: September 3, 1993
    Date of Patent: December 16, 1997
    Assignee: Solvay Interox (Societe Anonyme)
    Inventors: Nicholas Troughton, Marc Hoyos, Marcel Robberechts, Gilbert Vrambout
  • Process for preserving the mechanical strength properties of chemical paper pulps
    Patent number: 5534115
    Abstract: Process for preserving the mechanical strength properties of a chemical paper pulp, comprising two treatment stages by means of a peroxidic reagent, with the first stage in an acidic medium and the second stage in an alkaline medium, according to which a treatment by means of a reducing compound is interposed between the two stages.
    Type: Grant
    Filed: April 15, 1993
    Date of Patent: July 9, 1996
    Assignee: Interox International (Societe anonyme)
    Inventors: Marc Hoyos, Marcel Robberechts, Paul Essemaeker
  • Process for the treatment of cellulosic materials with oxidizing agents and microwaves
    Patent number: 4576609
    Abstract: Cellulosic materials and more particularly wood shavings, pulps, and cellulosic textile fibres are exposed to the combined action of microwaves and at least one oxidizing agent.In particular, the process makes it possible to improve the brightness of the end product.
    Type: Grant
    Filed: September 13, 1984
    Date of Patent: March 18, 1986
    Assignee: INTEROX (Societe Anonyme)
    Inventors: Jacques Hageman, Lucien Plumet, Marcel Robberechts