Patents by Inventor Stéphane QUERU

Stéphane QUERU 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).

  • Publication number: 20200283632
    Abstract: Process for preparing disodium 5,5?-indigosulfonate, the feedstock being indigo, this process including the following steps: i) the indigo is subjected to a sulfonation treatment resulting in a mixture that contains 5,5?-indigosulfonic acid, this process including: ii) a reduction treatment is applied to the mixture obtained in step i), and optionally a purification step, so as to obtain a composition including leuco-5,5?-indigosulfonic acid, iii) the leuco-5,5?-indigosulfonic acid is isolated from the composition resulting from step ii), iv) the leuco-5,5?-indigosulfonic acid resulting from step iii) is oxidized to give disodium 5,5?-indigosulfonate.
    Type: Application
    Filed: May 27, 2020
    Publication date: September 10, 2020
    Applicant: PROVEPHARM LIFE SOLUTIONS
    Inventors: Babak SAYAH, Stéphane QUERU, Michel FERAUD, Nicolas LOPEZ
  • Patent number: 10767054
    Abstract: Process for preparing disodium 5,5?-indigosulfonate, the feedstock being indigo, this process including the following steps: i) the indigo is subjected to a sulfonation treatment resulting in a mixture that contains 5,5?-indigosulfonic acid, this process including: ii) a reduction treatment is applied to the mixture obtained in step i), and optionally a purification step, so as to obtain a composition including leuco-5,5?-indigosulfonic acid, iii) the leuco-5,5?-indigosulfonic acid is isolated from the composition resulting from step ii), iv) the leuco-5,5?-indigosulfonic acid resulting from step iii) is oxidized to give disodium 5,5?-indigosulfonate.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: September 8, 2020
    Assignee: PROVEPHARM LIFE SOLUTIONS
    Inventors: Babak Sayah, Stéphane Queru, Michel Feraud, Nicolas Lopez
  • Publication number: 20200010438
    Abstract: Method for preparing 3,7-bis(dimethylamino)phenothiazin-5-ylium iodide, the method resulting in a high purity while being very simple to implement and producing high yields. The method uses phenothiazine as a starting material and includes the following steps: a) treating phenothiazine with diiodine, b) treating the reaction medium directly obtained from step a) with dimethylamine.
    Type: Application
    Filed: February 16, 2018
    Publication date: January 9, 2020
    Applicant: PROVEPHARM LIFE SOLUTIONS
    Inventors: Michel FERAUD, Babak SAYAH, Stéphane QUERU, Marina LAURENT
  • Publication number: 20190292370
    Abstract: Process for preparing disodium 5,5?-indigosulfonate, the feedstock being indigo, this process including the following steps: i) the indigo is subjected to a sulfonation treatment resulting in a mixture that contains 5,5?-indigosulfonic acid, this process including: ii) a reduction treatment is applied to the mixture obtained in step i), and optionally a purification step, so as to obtain a composition including leuco-5,5?-indigosulfonic acid, iii) the leuco-5,5?-indigosulfonic acid is isolated from the composition resulting from step ii), iv) the leuco-5,5?-indigosulfonic acid resulting from step iii) is oxidized to give disodium 5,5?-indigosulfonate.
    Type: Application
    Filed: November 27, 2017
    Publication date: September 26, 2019
    Applicant: PROVEPHARM LIFE SOLUTIONS
    Inventors: Babak SAYAH, Stéphane QUERU, Michel FERAUD, Nicolas LOPEZ