Patents by Inventor Maryvonne Thomas

Maryvonne Thomas 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).

  • Compositions based on aluminum hydroxychlorides
    Patent number: 4435308
    Abstract: Aluminum hydroxychloride compositions characterized by the presence of SO.sub.4.sup.-2 anions and at least one anion of selected organic acids are disclosed, as well as their particular utility in the treatment of soft water.
    Type: Grant
    Filed: June 8, 1978
    Date of Patent: March 6, 1984
    Assignee: Rhone-Poulenc Industries
    Inventors: Maryvonne Thomas, Jean Grosbois
  • Method for recovery of platinum and iridium from catalysts
    Patent number: 4069040
    Abstract: The invention relates to the recovery of the constituent elements of catalysts containing precious metals, such as platinum and iridium deposited on aluminous supports. This recovery is accomplished by a substantially total solubilization of the catalysts by means of hydrochloric acid and by extraction, for example by means of ion exchange resins. This system allows for a good separation of the platinum and the iridium.
    Type: Grant
    Filed: November 18, 1974
    Date of Patent: January 17, 1978
    Assignee: Rhone-Poulenc Industries
    Inventors: Maryvonne Thomas, Jean Grosbois
  • Method of recovering the constituents of catalysts comprising an aluminous carrier, platinum and iridium
    Patent number: 3999983
    Abstract: The invention concerns the recovery of the constituents of catalysts containing platinum and iridium. They are recovered by substantially totally solubilizing the catalysts with an oxidizing solution of hydrochloric acid, and by extracting the precious metals with an anionic resin from which the iridium is selectively washed out. This method enables the platinum and iridium to be completely separated and has the advantage of using only one bed of anionic resin.
    Type: Grant
    Filed: December 3, 1975
    Date of Patent: December 28, 1976
    Assignee: Rhone-Poulenc Industries
    Inventors: Jean Grosbois, Maryvonne Thomas