Patents by Inventor Bernard Siffert

Bernard Siffert 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).

  • Process for reducing the organic solvent losses in the treatment of a suspension resulting from the acid attack on an ore
    Patent number: 4450143
    Abstract: A process for treating a hydrometallurgical suspension resulting from the acid attack on an ore containing at least one metal element to be put to use, and non-attackable mineral materials, a fraction of which is formed of clays, comprising extracting the useful metal element which has gone into solution in the attack operation, by means of an organic solvent belonging to the group of alkyl phosphates, which is characterized by introducing a condensed mineral phosphate into the ore attack medium, for the purpose of limiting the losses due to adsorption of the organic extraction solvent by the clays.The process applies more particularly to uraniferous, molybdeniferous, vanadiferous and cobaltiferous ores.
    Type: Grant
    Filed: July 1, 1981
    Date of Patent: May 22, 1984
    Assignee: Pechiney
    Inventors: Antoine Floreancig, Bernard Siffert, Jean-Jacques Trescol
  • Process and apparatus for desalting crude petroleum
    Patent number: 4200550
    Abstract: A process for desalting crude petroleum comprises breaking down a stable emulsion of water and crude petroleum when formed in a desalter, by injecting a demulsifying agent, such as di-2-ethyl hexyl sulphosuccinate, into the desalter at a predetermined level, when the sample taken at this level contain a predetermined content of stable emulsion.An apparatus for carrying out this process continuously is also included.
    Type: Grant
    Filed: April 19, 1978
    Date of Patent: April 29, 1980
    Assignees: Compagnie Francaise de Raffinage, Universal Matthey Products S.A.
    Inventors: Claude Scherrer, Claude Baumann, Herbert Wiegandt, John-Russel Richmond, Bernard Siffert, Claudine Bourgeois