Patents by Inventor Etsushu Kuraoka

Etsushu Kuraoka 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 separation and recovery of elements from radioactive liquid wastes
    Patent number: 6843921
    Abstract: A method of separation and recovery of elements from radioactive liquid wastes, includes a step of bringing into contact a high-level radioactive liquid waste containing separation target elements including Americium, Curium, Zirconium, Molybdenum, Palladium and rare earth elements with solid absorbent containing organophosphorus compounds so that the separation target elements are absorbed in the solid absorbent, a step of bringing into contact the solid absorbent with an acidic solution containing diethylenetriaminepentaacetic acid so that Americium, Curium, Zirconium, Molybdenum, Palladium and heavy rare earth elements are eluted from the solid absorbent, and a step of bringing into contact the solid absorbent underwent the first elution step with water or dilute nitric acid so that light rare earth elements are eluted from the solid absorbent.
    Type: Grant
    Filed: May 30, 2003
    Date of Patent: January 18, 2005
    Assignees: Institute of Research and Innovation, Japan Nuclear Cycle Development Institute
    Inventors: Etsushu Kuraoka, Anyun Zhang, Mikio Kumagai, Masayuki Watanabe, Hirofumi Nakamura
  • Method of separation and recovery of elements from radioactive liquid wastes
    Publication number: 20030234223
    Abstract: A method of separation and recovery of elements from radioactive liquid wastes, includes a step of bringing into contact a high-level radioactive liquid waste containing separation target elements including Americium, Curium, Zirconium, Molybdenum, Palladium and rare earth elements with solid absorbent containing organophosphorus compounds so that the separation target elements are absorbed in the solid absorbent, a step of bringing into contact the solid absorbent with an acidic solution containing diethylenetriaminepentaacetic acid so that Americium, Curium, Zirconium, Molybdenum, Palladium and heavy rare earth elements are eluted from the solid absorbent, and a step of bringing into contact the solid absorbent underwent the first elution step with water or dilute nitric acid so that light rare earth elements are eluted from the solid absorbent.
    Type: Application
    Filed: May 30, 2003
    Publication date: December 25, 2003
    Inventors: Etsushu Kuraoka, Anyun Zhang, Mikio Kumagai, Masayuki Watanabe, Hirofumi Nakamura