Patents by Inventor Jean-Yves Cojan

Jean-Yves Cojan 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 solidifying and stabilizing a concentrated aqueous sodium hydroxide solution
    Patent number: 7812209
    Abstract: The present invention relates to a process for the solidification and stabilization of concentrated aqueous sodium hydroxide solution, characterized in that the following steps are carried out: a) a hydraulic binder containing blast furnace slag is mixed with said sodium hydroxide solution, in the presence of at least one additional source of calcium ions and/or magnesium ions and/or silica, to form a slurry, and b) the slurry is left to set to a solid product. The invention further relates to the solid product obtained by carrying out the process of the invention. The invention can be applied to the treatment of sodium hydroxide solutions that are radioactive or contaminated by other pollutants.
    Type: Grant
    Filed: February 3, 2006
    Date of Patent: October 12, 2010
    Assignee: INERTEC
    Inventors: Christian Jacquemmoz, Alain Jean Pierre, Filipe Teixeira, Jean-Yves Cojan, David Verschuere, Fabrice Ledoyen
  • Method for Solidifying and Stabilizing a Concentrated Aqueous Sodium Hydroxide Solution
    Publication number: 20080139864
    Abstract: The present invention relates to a process for the solidification and stabilization of concentrated aqueous sodium hydroxide solution, characterized in that the following steps are carried out: a) a hydraulic binder containing blast furnace slag is mixed with said sodium hydroxide solution, in the presence of at least one additional source of calcium ions and/or magnesium ions and/or silica, to form a slurry, and b) the slurry is left to set to a solid product. The invention further relates to the solid product obtained by carrying out the process of the invention. The invention can be applied to the treatment of sodium hydroxide solutions that are radioactive or contaminated by other pollutants.
    Type: Application
    Filed: February 3, 2006
    Publication date: June 12, 2008
    Applicant: INERTEC
    Inventors: Christian Jacquemmoz, Alain Jean Pierre, Filipe Teixeira, Jean-Yves Cojan, David Verschuere, Fabrice Ledoyen
  • Method for the synthesis of ferrates
    Patent number: 7115242
    Abstract: A method of synthesis of alkali metal ferrates and alkaline earth metal ferrates, in which a trivalent iron compound is mixed with potash and optionally persulphate, and the mixture is heated at a temperature in the range of about 250 to about 500° C. for about 1 to 10 hours. The invention also relates to the use of the ferrates obtained by this method.
    Type: Grant
    Filed: June 10, 2004
    Date of Patent: October 3, 2006
    Assignee: INERTEC
    Inventors: Jean-Yves Cojan, David Verschuere, Farouk Tedjar
  • Method for the synthesis of ferrates
    Publication number: 20040253171
    Abstract: A method of synthesis of alkali metal ferrates and alkaline earth metal ferrates, in which a trivalent iron compound is mixed with potash and optionally persulphate, and the mixture is heated at a temperature in the range of about 250 to about 500° C. for about 1 to 10 hours. The invention also relates to the use of the ferrates obtained by this method.
    Type: Application
    Filed: June 10, 2004
    Publication date: December 16, 2004
    Applicant: Inertec
    Inventors: Jean-Yves Cojan, David Verschuere, Farouk Tedjar