Patents Assigned to PROVEPHARM LIFE SOLUTIONS
  • 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