Patents by Inventor Richard Hardt

Richard Hardt 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).

  • Decoloration of polyisocyanates containing isocyanurate and diretdione groups
    Patent number: 5919887
    Abstract: A process for decoloring polyisocyanates containing isocyanurate and uretdione groups comprises treating the demonomerized polyisocyanates containing isocyanurate and uretdione groups with oxygen.
    Type: Grant
    Filed: May 19, 1997
    Date of Patent: July 6, 1999
    Assignee: BASF Aktiengesellschaft
    Inventors: Hermann Graf, Ernst Deuker, Stefan Wolff, Ludwig Schuster, Serge Wack, Richard Hardt