Patents by Inventor Yooji Nakajima

Yooji Nakajima 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).

  • Fluid-quality control method, fluid-quality control apparatus, and electric-discharge machining apparatus employing the same
    Patent number: 8217296
    Abstract: Target fluid is made into electrolyte solution when measured fluid-quality value is lower than a first condition value, by substituting an impurity anion contained in the target fluid with a predetermined anion and substituting an impurity cation contained in the target fluid with a predetermined cation, and purified when the fluid-quality value is higher than a second condition value. The above procedures are repeated, so that the fluid-quality value of the target fluid falls within a predetermined range, to make the target fluid into electrolyte solution with a correlation between pH and conductivity.
    Type: Grant
    Filed: April 5, 2006
    Date of Patent: July 10, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hisakatsu Kawarai, Shuuichiro Ishihara, Yooji Nakajima, Hisashi Yamada
  • FLUID-QUALITY CONTROL METHOD, FLUID-QUALITY CONTROL APPARATUS, AND ELECTRIC-DISCHARGE MACHINING APPARATUS EMPLOYING THE SAME
    Publication number: 20100219164
    Abstract: Target fluid is made into electrolyte solution when measured fluid-quality value is lower than a first condition value, by substituting an impurity anion contained in the target fluid with a predetermined anion and substituting an impurity cation contained in the target fluid with a predetermined cation, and purified when the fluid-quality value is higher than a second condition value. The above procedures are repeated, so that the fluid-quality value of the target fluid falls within a predetermined range, to make the target fluid into electrolyte solution with a correlation between pH and conductivity.
    Type: Application
    Filed: April 5, 2006
    Publication date: September 2, 2010
    Inventors: Hisakatsu Kawarai, Shuuichiro Ishihara, Yooji Nakajima, Hisashi Yamada