Patents by Inventor Pierre Patigny

Pierre Patigny 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).

  • Process for separating by means of crown ethers the uranium and plutonium present in an aqueous medium resulting from the reprocessing of irradiated nuclear fuels
    Patent number: 5028402
    Abstract: Process for separating plutonium from uranium contained in a nitric acid aqueous solution from the reprocessing of irradiated fuels comprising plutonium, uranium and fission products by means of crown ethers. Nitric acid aqueous solution (5) containing plutonium, uranium and fission products is contacted at (2) with an organic liquid membrane (3) containing a crown ether. The uranium and plutonium are extracted in the liquid membrane (3) and then transferred by said membrane into a receiving solution (7), which becomes enriched with uranium, because the latter is transferred more rapidly than the plutonium. The crown ether can be DCH 18 C6 or DB 18 C6.
    Type: Grant
    Filed: June 16, 1989
    Date of Patent: July 2, 1991
    Assignee: Cogema Compagnie General des Matieres Nucleaires
    Inventors: Jacques Foos, Pierre Epherre, Alain Guy, Marc Lemaire, Rodolph Chomel, Gerard Cauquil, Pierre Patigny, Alain Vian