Patents by Inventor Paulus Johannes Jacobus Pieters

Paulus Johannes Jacobus Pieters 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 production of cyclohexanone oxime
    Patent number: 6844469
    Abstract: The invention relates to a process for the production of cyclohexanone oxime in which a phosphate-containing aqueous reaction medium is cycled from a hydroxylammonium synthesis zone to a cyclohexanone oxime synthesis zone and back to the hydroxylammonium synthesis zone, in which hydroxylammonium synthesis zone hydroxylammonium is formed by catalytic reduction of nitrate with hydrogen, and in which cyclohexanone oxime synthesis zone hydroxylammonium is reacted with cyclohexanone to form cyclohexanone oxime, where the concentration hydroxylammonium in the aqueous reaction medium entering the cyclohexanone oxime synthesis zone is higher than 1.0 mol/l.
    Type: Grant
    Filed: May 31, 2001
    Date of Patent: January 18, 2005
    Assignee: DSM Ip Assets B.V.
    Inventors: Arno Benneker, Paulus Johannes Jacobus Pieters, Alex Pit, Henk Oevering