Patents by Inventor Takeharu Ueda

Takeharu Ueda 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).

  • Acid liquid leakage sensor
    Patent number: 8088331
    Abstract: An acid liquid leakage sensor quickly detecting liquid leakage from a device, such as a battery or the like, containing an acid liquid includes a first conductive member, a second conductive member, and an electrically insulating material which establishes an electrically insulating state between these first and second conductive members. The electrically insulating material includes a macromolecular compound having a basic functional group, and an electrical insulation characteristic or high resistance characteristic that decreases upon reaction with an acid liquid. It is possible to detect leakage of acid liquid, such as battery fluid, by detecting the change of conductive state between the first conductive member and the second conductive member which accompanies a decrease of the electrical insulation characteristic or high resistance characteristic of the electrically insulating material, when acid liquid leaks out and drips down the electrically insulating material.
    Type: Grant
    Filed: February 26, 2004
    Date of Patent: January 3, 2012
    Assignees: Origin Electric Company, Limited, NTT Facilities, Inc.
    Inventors: Takeharu Ueda, Kunihisa Satoh, Keiichi Sato, Ichiro Kiyokawa, Tomonobu Tsujikawa, Toshio Matsushima
  • Acid Liquid Leakage Sensor
    Publication number: 20070275296
    Abstract: An acid liquid leakage sensor quickly detecting liquid leakage from a device, such as a battery or the like, containing an acid liquid includes a first conductive member, a second conductive member, and an electrically insulating material which establishes an electrically insulating state between these first and second conductive members. The electrically insulating material includes a macromolecular compound having a basic functional group, and an electrical insulation characteristic or high resistance characteristic that decreases upon reaction with an acid liquid. It is possible to detect leakage of acid liquid, such as battery fluid, by detecting the change of conductive state between the first conductive member and the second conductive member which accompanies a decrease of the electrical insulation characteristic or high resistance characteristic of the electrically insulating material, when acid liquid leaks out and drips down the electrically insulating material.
    Type: Application
    Filed: February 26, 2004
    Publication date: November 29, 2007
    Applicants: Origin Electric Company, Limited, NTT facilities, Inc.
    Inventors: Takeharu Ueda, Kunihisa Satoh, Keiichi Sato, Ichiro Kiyokawa, Tomonobu Tsujikawa, Toshio Matsushima