Patents by Inventor Yoshikazu Koma

Yoshikazu Koma 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 of separating trivalent actinides and rare earth elements
    Patent number: 5708958
    Abstract: A method is provided for separating trivalent actinides and rare earth elements in the TRUEX method using a CMPO-TBP mixed solvent. The method of separating trivalent actinides and rare earth elements comprises a trivalent actinide/rare earth extraction step wherein trivalent actinides and rare earth elements are extracted by a solvent from highly acid waste generated by reprocessing of spent nuclear fuel, a nitric acid removal step wherein the nitric acid concentration of the solvent used to extract the trivalent actinides and rare earth elements is reduced, and a separation step wherein the trivalent actinides and rare earth elements contained in the solvent of low nitric acid concentration, are separated from each other.
    Type: Grant
    Filed: August 12, 1996
    Date of Patent: January 13, 1998
    Assignee: Doryokuro Kakunenryo Kaihatsu Jigyodan
    Inventors: Yoshikazu Koma, Masayuki Watanabe, Shinichi Nemoto