Patents by Inventor Cl ement Hill

Cl ement Hill 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).

  • Bis-crown calix [4]arenes, their preparation process and their use for the selective extraction of cesium and actinides
    Patent number: 5607591
    Abstract: The invention relates to bis-crown calix[4]arenes, their preparation process and their use for the selective extraction of cesium and actinides. Bis-crown calix[4]arenes are in accordance with the formula: ##STR1## in which R.sup.1 and R.sup.2 respectively represent X(C.sub.2 H.sub.4 X).sub.m and X(C.sub.2 H.sub.4 X).sub.n with X.dbd.O, NH and/or N(CH.sub.3), m and n=3, 4, 5 or 6, or X (C.sub.2 H.sub.4 X).sub.p/2 XY(C.sub.2 H.sub.4 X).sub.p/2 with p=2 or 4 and Y=cycloalkylene or arylene. These bis-crown calix[4]arenes, whose benzene nuclei are optionally substituted by alkyl groups, can be used as an extracant, e.g. in the form of a liquid membrane, for separating cesium from acid solutions containing sodium in a large quantity compared with the cesium quantity, e.g. effluents of irradiated fuel reprocessing plants.
    Type: Grant
    Filed: May 17, 1995
    Date of Patent: March 4, 1997
    Assignee: Commissariat A L'Energie Atomique
    Inventors: Jean-Fran.cedilla.ois Dozol, Zouhair Asfari, Cl ement Hill, Jacques Vicens