Patents by Inventor Stefan Ridder

Stefan Ridder 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).

  • METHOD FOR PRODUCING IRON OXIDE PIGMENTS
    Publication number: 20250066612
    Abstract: The present invention relates to a method for producing iron oxide pigments according to the Penniman process, characterized in that no separate nucleation step is carried out, and to the use of such iron oxide pigments.
    Type: Application
    Filed: December 20, 2022
    Publication date: February 27, 2025
    Applicant: LANXESS Deutschland GmbH
    Inventors: Norbert Etzenbach, Matthias Boers, Stefan Ridder