Patents by Inventor Marie-Hélène Noire

Marie-Hélène Noire 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 preparing a powder comprising particles of triuranium octoxide and particles of plutonium dioxide
    Patent number: 11594344
    Abstract: A method for preparing a powder comprising an intimate mixture of U3O8 particles and PuO2 particles and which may further comprise particles of ThO2 or NpO2. The method comprises: preparing, via oxalic precipitations, an aqueous suspension S1 of particles of uranium(IV) oxalate and an aqueous suspension S2 of particles of plutonium(IV) oxalate; mixing the aqueous suspension S1 with the aqueous suspension S2 to obtain an aqueous suspension S1+2; separating the aqueous suspension S1+2 into an aqueous phase and a solid phase comprising the particles of uranium(IV) oxalate and the particles of plutonium(IV) oxalate; and calcining the solid phase to convert (1) the particles of uranium(IV) oxalate to particles of triuranium octoxide and (2) the particles of plutonium(IV) oxalate to particles of plutonium(IV) dioxide, whereby the powder is obtained.
    Type: Grant
    Filed: December 7, 2018
    Date of Patent: February 28, 2023
    Assignees: COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES, ORANO RECYCLAGE
    Inventors: François Poncelet, Nicolas Vigier, Bénédicte Arab-Chapelet, Aurélie Gauthe, Eléonore Welcomme, Marie Hélène Noire
  • METHOD FOR PREPARING A POWDER COMPRISING PARTICLES OF TRIURANIUM OCTOXIDE AND PARTICLES OF PLUTONIUM DIOXIDE
    Publication number: 20210166826
    Abstract: A method for preparing a powder comprising an intimate mixture of U3O8 particles and PuO2 particles and which may further comprise particles of ThO2 or NpO2. The method comprises: preparing, via oxalic precipitations, an aqueous suspension S1 of particles of uranium(IV) oxalate and an aqueous suspension S2 of particles of plutonium(IV) oxalate; mixing the aqueous suspension S1 with the aqueous suspension S2 to obtain an aqueous suspension S1+2, separating the aqueous suspension S1+2 into an aqueous phase and a solid phase comprising the particles of uranium(IV) oxalate and the particles of plutonium(IV) oxalate; and calcining the solid phase to convert (1) the particles of uranium(IV) oxalate to particles of triuranium octoxide and (2) the particles of plutonium(IV) oxalate to particles of plutonium(IV) dioxide, whereby the powder is obtained.
    Type: Application
    Filed: December 7, 2018
    Publication date: June 3, 2021
    Inventors: François Poncelet, Nicolas Vigier, Bénédicte Arab-Chapelet, Aurélie Gauthe, Eléonore Welcomme, Marie Hélène Noire
  • Method for making an optical fiber chemical sensor comprising a colored indicator, useful in particular for measuring nitric acid
    Patent number: 6864095
    Abstract: The invention concerns the production of a chemical sensor which can be used to measure nitric acidity. This sensor is produced using a sol-gel method for depositing a porous film, containing a colored indicator, on the core of an optic fiber. The pH of the initial sol is adjusted as are other conditions for implementing the sol-gel method to obtain stability of the signal (curves 1 to 4) emitted by the sensor in an 8N nitric medium for at least 1000 hours.
    Type: Grant
    Filed: August 21, 2001
    Date of Patent: March 8, 2005
    Assignees: Commissariat a l'Energie Atomique, Compagnie Generale des Matieres Nucleaires
    Inventors: Marie-Hélène Noire, Christophe Bouzon, Thierry Davin
  • Method for making an optical fibre chemical sensor comprising a coloured indicator, useful in particular for measuring nitric acid
    Publication number: 20020182740
    Abstract: The invention concerns the production of a chemical sensor which can be used to measure nitric acidity.
    Type: Application
    Filed: April 17, 2002
    Publication date: December 5, 2002
    Inventors: Marie-Helene Noire, Christophe Bouzon, Thierry Davin