Patents by Inventor Jean-Louis Pignan

Jean-Louis Pignan 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).

  • Device for the recovery of gases formed during the electrolysis of alkali metal chlorides
    Patent number: 4263117
    Abstract: Device for the recovery of gases formed during the electrolytic preparation of alkali metal chlorides, characterized by scrubbing columns having a hydraulic guard, and by automatic distribution systems for inert gas and for air, said distribution systems being controlled by the operation of the current generator and by the operating amperage of the cells, respectively.This device permits the recovery, under satisfactory safety conditions, of the hydrogen present during the electrolysis of alkali metal chlorides for the production of alkali metal chlorates.
    Type: Grant
    Filed: November 8, 1979
    Date of Patent: April 21, 1981
    Assignee: Produits Chimiques Ugine Kuhlmann
    Inventors: Jean-Louis Pignan, Georges Cusset
  • Process for the electrolytic preparation of alkali metal chlorates
    Patent number: 4250003
    Abstract: Improvement in the processes for the manufacture of alkali metal chlorates by electrolysis of alkali metal chlorides characterized by the fact that the temperature of electrolysis is reduced by 30.degree. C. to 50.degree. C. when the voltage of the cell reaches an undesirable level and then reestablishing the normal operating conditions of the cell.
    Type: Grant
    Filed: November 5, 1979
    Date of Patent: February 10, 1981
    Assignee: Produits Chimiques Ugine Kuhlmann
    Inventors: Roger Charvin, Jean-Louis Pignan