Patents by Inventor Jo{overscore (e)}lle Carpena

Jo{overscore (e)}lle Carpena 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 to confine plutonium in apatitic ceramics and products obtained using said process
    Patent number: 6624339
    Abstract: A phosphosilicate apatite useful as a confinement matrix for radioactive waste, and having the formula: MtCaxLnyHfwPuz−w(PO4)6−u(SiO4)uF2  (I) wherein: M represents an alkaline metal, Ln represents at least one cation selected from lanthanides, and t, x, y, z, w and u are such that: 0≦t≦1, 8≦x≦10, 0≦y≦1, 0<z≦0.5, 0≦w≦z, and 0<u≦y+2z, and the total number of positive charges provided by the alkaline metal, Ca, Ln, Hf and Pu cations are equal to 20+u is prepared by a sintering-reaction of a mixture of reagent powders, in a neutral or reducing atmosphere, with application of pressure before or during sintering.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: September 23, 2003
    Assignees: Commissariat a l'Energie Atomique, Compagnie Generale des Matieres Nucleaires
    Inventors: Jo{overscore (e)}lle Carpena, Laurent Boyer, Jean-Louis Lacout