Patents by Inventor Ludwig Stieglitz

Ludwig Stieglitz 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 increasing the lifetime of an extraction medium used for reprocessing spent nuclear fuel and/or breeder materials
    Patent number: 4059671
    Abstract: A method is provided for increasing the lifetime of an extraction medium containing an organophosphorus acid ester and a hydrocarbon and being used for reprocessing spent nuclear fuel and/or breeder materials. Impurities resulting from chemical and/or radiolytic decomposition and interfering compounds of such impurities with radionuclides are removed from the extraction medium by bringing the extraction medium, after use, into intimate contact with an aqueous hydrazine hydrate solution having a concentration of between about 0.1 molar and about 1.0 molar at a temperature between about 20.degree. C to about 75.degree. C. The aqueous hydrazine hydrate solution is then separated from the extraction medium.
    Type: Grant
    Filed: October 20, 1975
    Date of Patent: November 22, 1977
    Assignee: Gesellschaft fur Kernforschung m.b.H.
    Inventors: Helmut Schmieder, Ludwig Stieglitz