Patents by Inventor Takako Okuno

Takako Okuno 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 purification of salt solutions for electrolysis
    Patent number: 6238544
    Abstract: In a method of removing impurities, especially iodine and/or silica ions, from a salt solution to be used for electrolysis, the salt solution and zirconium hydroxide are brought into contact with each other under acidic conditions, and the zirconium hydroxide adsorbs the impurities. Thereafter, the zirconium hydroxide containing the adsorbed impurities is brought into contact with an aqueous solution at a higher pH value to desorb the impurities from the zirconium hydroxide, thereby enabling the zirconium hydroxide to be recycled.
    Type: Grant
    Filed: August 16, 1999
    Date of Patent: May 29, 2001
    Assignee: Chlorine Engineers Corp., Ltd.
    Inventors: Chisako Oohara, Terumi Matsuoka, Takamichi Kishi, Takako Okuno