Patents by Inventor Grégory Lefevre

Grégory Lefevre 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 extracting a refractory metal from an ore, a concentrate or a waste product
    Publication number: 20220364205
    Abstract: The present invention relates to a method for extracting a refractory metal selected from Nb, Ta, Mo, W and V, from a solid material comprising the refractory metal in an oxidised form, the method using a layered double hydroxide, and the use of a layered double hydroxide for extracting or purifying a refractory metal selected from Nb, Ta, Mo, W and V.
    Type: Application
    Filed: July 22, 2020
    Publication date: November 17, 2022
    Inventors: Grégory LEFEVRE, Thomas DEGABRIEL
  • Method for exchanging interlayer anions of a layered double hydroxide
    Patent number: 10882753
    Abstract: The invention relates to a method for exchanging interlayer anions of a layered double hydroxide (LDH) with other anions whose affinity for the LDH is lower than the one of the starting interlayer anions, which comprises the successive steps of: (1) exchanging the starting interlayer anions of a layered double hydroxide with polyoxometalate anions in order to obtain a layered double hydroxide with polyoxometalate anions as interlayer anions, and (2) exchanging the polyoxometalate anions of the layered double hydroxide obtained in step (1) with other anions whose affinity for the LDH is lower than the one of the starting interlayer anions in order to obtain a layered double hydroxide with other anions as interlayer anions.
    Type: Grant
    Filed: September 15, 2017
    Date of Patent: January 5, 2021
    Inventor: Grégory Lefevre
  • A Method For Exchanging Interlayer Anions Of A Layered Double Hydroxide
    Publication number: 20190263671
    Abstract: The invention relates to a method for exchanging interlayer anions of a layered double hydroxide (LDH) with other anions whose affinity for the LDH is lower than the one of the starting interlayer anions, which comprises the successive steps of: (1) exchanging the starting interlayer anions of a layered double hydroxide with polyoxometalate anions in order to obtain a layered double hydroxide with polyoxometalate anions as interlayer anions, and (2) exchanging the polyoxometalate anions of the layered double hydroxide obtained in step (1) with other anions whose affinity for the LDH is lower than the one of the starting interlayer anions in order to obtain a layered double hydroxide with other anions as interlayer anions.
    Type: Application
    Filed: September 15, 2017
    Publication date: August 29, 2019
    Applicants: Paris Sciences Et Lettres - Quartier Latin, Centre National de la Recherche Scientifique (CNRS)
    Inventor: Grégory Lefevre