Patents by Inventor Sonia Lewey

Sonia Lewey 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 separation of the rare earths by solvent extraction
    Patent number: 4016237
    Abstract: Production rates for solvent extraction separation of the rare earths and yttrium from each other can be improved by the substitution of di(2-ethylhexyl) mono-thiophosphoric acid for di(2-ethylhexyl) phosphoric acid. The di(2-ethylhexyl) mono-thiophosphoric acid does not form an insoluble polymer at approximately 50% saturation as does the former extractant, permitting higher feed solution concentration and thus greater throughput.
    Type: Grant
    Filed: September 8, 1975
    Date of Patent: April 5, 1977
    Assignee: The United States of America as represented by the United States Energy Research and Development Administration
    Inventors: George W. Mason, Sonia Lewey