Patents by Inventor Helmut Duddeck

Helmut Duddeck 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).

  • Patent number: 6071475
    Abstract: A process is disclosed for preserving paper involving the following steps:(a) a plurality of paper layers in contact with one another at least in regions is simultaneously brought into contact with a preservative fluid containing polycondensates based on one or more hydrolytic polycondensation-capable compounds of elements M of main groups III-V and sub-groups II-IV of the Periodic Table; in said polycondensates, at least one organic group (G) with at least two carbon atoms and for each carbon atom at least one atom selected from hydrogen or fluorine and without polar substituents is bound, either directly via one of the carbon atoms or via a connecting group A, to at least 0.1% of the central atoms M; and(b) the paper thus treated with the preservative fluid is dried and/or hardened.
    Type: Grant
    Filed: May 21, 1998
    Date of Patent: June 6, 2000
    Assignee: Institut fur Neue Materialien Gemeinnutzige
    Inventors: Helmut Schmidt, Reiner Kasemann, Stefan Sepeur, Helmut Duddeck