Patents by Inventor Denis Geoffroy

Denis Geoffroy 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).

  • Procedure to optimize materials for cathodes and cathode material having enhanced electrochemical properties
    Patent number: 9269950
    Abstract: A material C-AxM(XO4)y that is of particles of a compound of the formula AxM(XO4)y, wherein said particles include a carbon deposit deposited by means of pyrolysis on at least a portion of the surface thereof, and where: A is Li alone or partially replaced by at most 10 atomic % of Na or K; M is Fe(II), or Mn(II), or mixtures thereof alone or partially replaced by at most 30 atomic % of one or more metals selected from Mn, Ni and Co and/or at most 5% of Fe(III); XO4 is PO4 alone or partially replaced by at most 10 molar % of at least one group selected from SO4, SiO4 and MoO4; and where said material has a calcium impurity content of lower than about 1000 ppm.
    Type: Grant
    Filed: December 4, 2012
    Date of Patent: February 23, 2016
    Assignees: JOHNSON MATTHEY PUBLIC LIMITED COMPANY, BATHIUM CANADA INC.
    Inventors: Denis Geoffroy, Guoxian Liang, Michel Gauthier, Thorsten Lahrs, Nathalie Ravet, Michel Parent, Alain Vallee, Patrick Leblanc, Frederic Cotton
  • Method for heat treating a carbon coated alkali metal oxyanion electrode material
    Patent number: 8668842
    Abstract: A process for preparing an alkali metal oxyanion electrode material having a carbon coating deposited by a thermal treatment, said process comprising a thermal step under a humidified atmosphere of: (i) said alkali metal oxyanion electrode material having a carbon coating deposited by a thermal treatment; (ii) precursors of said alkali metal oxyanion electrode material and an organic precursor of carbon; or (iii) said alkali metal oxyanion electrode material and an organic precursor of carbon, wherein said thermal step is performed at a temperature in the range of about 300° C. to about 950° C.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: March 11, 2014
    Assignee: Clariant (Canada) Inc.
    Inventors: Guoxian Liang, Jasmin Dufour, Michel Gauthier, Nathalie Ravet, Denis Geoffroy
  • Method for improving the electrochemical performances of an alkali metal oxyanion electrode material and alkali metal oxyanion electrode material obtained therefrom
    Publication number: 20110210293
    Abstract: Process for improving the electrochemical performance of an alkali metal oxyanion electrode material having a pyrolitic carbon deposit thereon, comprising a heat treatment under a humidified atmosphere where the heat treatment is performed at a temperature in the range of about 300° C. to about 950° C.
    Type: Application
    Filed: December 17, 2010
    Publication date: September 1, 2011
    Applicant: Phostech Lithium Inc.
    Inventors: Guoxian Liang, Jasmin Dufour, Michel Gauthier, Nathalie Ravet, Denis Geoffroy