Patents by Inventor Lambertus Gerhardus Johannus Olde Hanter

Lambertus Gerhardus Johannus Olde Hanter 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).

  • Aminoalkane diphosphonic acids in pulp bleaching
    Patent number: 5641386
    Abstract: A process for the bleaching of pulp comprising the step of bleaching the pulp with hydrogen peroxide and an effective amount of at least one biodegradable 1-aminoalkane-1,1-diphosphonate chelating agent to enhance the bleaching of the pulp, is disclosed. Also disclosed is the use of a 1-aminoalkane-1,1-diphosphonate to enhance the bleaching of pulp with hydrogen peroxide, as well as the pretreatment of pulp with a 1-aminoalkane-1,1-diphosphonate prior to the step of bleaching with hydrogen peroxide. Finally, the deinking of pulp in the presence of 1-aminoalkane-1,1-diphosphonate is also disclosed.
    Type: Grant
    Filed: February 8, 1995
    Date of Patent: June 24, 1997
    Assignee: Akzo Nobel NV
    Inventors: Eltjo Boelema, Charles Manuel Navarro, Lambertus Gerhardus Johannus Olde Hanter, Marcellinus Alexander Van Doorn