Patents by Inventor Paul Duprez

Paul Duprez 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 the regeneration of waste paper
    Patent number: 4381969
    Abstract: Waste paper containing encapsulated constituents such as inks is bleached by pulping it in the presence of an aqueous alkaline solution which contains a peroxide compound such as hydrogen peroxide.
    Type: Grant
    Filed: May 22, 1981
    Date of Patent: May 3, 1983
    Assignee: Interox
    Inventors: Jean De Ceuster, Paul Duprez
  • Process for reclaiming waste paper
    Patent number: 4343679
    Abstract: Process for reclaiming waste paper without deinking which involves pulping the waste paper in the presence of soft water and then adding to the pulp thus obtained a compound capable of liberating, in aqueous solution, ions with a positive charge equal to or greater than 2.
    Type: Grant
    Filed: October 23, 1980
    Date of Patent: August 10, 1982
    Assignee: Interox (Societe Anonyme)
    Inventors: Jean De Ceuster, Paul Duprez