Patents by Inventor Yumi Yaita

Yumi Yaita 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 chemically decontaminating components of radioactive material handling facility and system for carrying out the same
    Publication number: 20040035443
    Abstract: Ozone gas having a high ozone concentration is generated by a solid electrolyte electrolytic process. An ozone solution is prepared by injecting the ozone gas into an acidic solution of pH 6 or below. The ozone solution heated at a temperature in the range of 50° to 90° C. is supplied to a contaminated object to oxidize and dissolve a chromium oxide film by an oxidizing dissolving process. The ozone solution used in the oxidizing dissolving process is irradiated with ultraviolet rays to decompose ozone contained in the ozone solution, the ozone solution is passed through an ion-exchange resin to remove ions contained in the ozone solution. An oxalic acid solution is supplied to the contaminated object to dissolve an iron oxide film by a reductive dissolving process.
    Type: Application
    Filed: August 22, 2003
    Publication date: February 26, 2004
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yumi Yaita, Masami Enda, Hitoshi Sakai
  • Method of chemically decontaminating components of radioactive material handling facility and system for carrying out the same
    Patent number: 6635232
    Abstract: Ozone gas having a high ozone concentration is generated by a solid electrolyte electrolytic process. An ozone solution is prepared by injecting the ozone gas into an acidic solution of pH 6 or below. The ozone solution heated at a temperature in the range of 50° to 90° C. is supplied to a contaminated object to oxidize and dissolve a chromium oxide film by an oxidizing dissolving process. The ozone solution used in the oxidizing dissolving process is irradiated with ultraviolet rays to decompose ozone contained in the ozone solution, the ozone solution is passed through an ion-exchange resin to remove ions contained in the ozone solution. An oxalic acid solution is supplied to the contaminated object to dissolve an iron oxide film by a reductive dissolving process.
    Type: Grant
    Filed: December 22, 1999
    Date of Patent: October 21, 2003
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yumi Yaita, Masami Enda, Hitoshi Sakai