Patents by Inventor Dagmar Kraft

Dagmar Kraft 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).

  • Calixarene derivatives, their preparation process and their use for extracting actinides and lanthanides
    Patent number: 5866087
    Abstract: The invention relates to novel calixarenes of formula: ##STR1## in which m is equal to 0 or 1, n is an integer from 2 to 8, with 4.ltoreq.n(m+1).ltoreq.8,R.sup.1 and R.sup.2, which can be the same or different, are alkyl or O-nitrophenoxyalkyl groups andR.sup.3 and R.sup.4, which can be the same or different, are alkyl or aryl groups.The calixarenes can be used for extracting actinides and lanthanides from aqueous solutions from spent fuel reprocessing.
    Type: Grant
    Filed: October 14, 1997
    Date of Patent: February 2, 1999
    Assignee: Commissariat a l'Energie Atomique
    Inventors: Jean-Fran.cedilla.ois Dozol, Helene Rouquette, Volker Bohmer, Cordula Gruttner, Ralf A. Jakobi, Dagmar Kraft, Walter Vogt