Patents by Inventor Chang-Ha Ryu

Chang-Ha Ryu 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 and apparatus for measuring in-situ stress of rock using thermal crack
    Patent number: 8082105
    Abstract: Disclosed is a method and apparatus for measuring in-situ stress in rock using a thermal crack. The method involves forming a borehole, cooling a wall of the borehole, applying tensile thermal stress, forming a crack in the borehole wall, and measuring temperature and cracking point. Afterwards, the borehole wall is heated to close the formed crack, the borehole wall is cooled again to re-open the crack, and temperature is measured when the crack is re-opened. The in-situ stress of the rock is calculated using a first cracking temperature at which the crack is formed and a second cracking temperature at which the crack is re-opened. Further, the apparatus cools, heats and re-cools the borehole wall, thereby measuring the first cracking temperature, the second cracking temperature, and the cracking point.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: December 20, 2011
    Assignee: Korea Institute of Geoscience and Mineral Resources (KIGAM)
    Inventors: Chang-Ha Ryu, Dong-Woo Ryu, Byung-Hee Choi, Loui Porathur John, Jung-Ho Synn
  • METHOD AND APPARATUS FOR MEASURING IN-SITU STRESS OF ROCK USING THERMAL CRACK
    Publication number: 20090070043
    Abstract: Disclosed is a method and apparatus for measuring in-situ stress in rock using a thermal crack. The method involves forming a borehole, cooling a wall of the borehole, applying tensile thermal stress, forming a crack in the borehole wall, and measuring temperature and cracking point. Afterwards, the borehole wall is heated to close the formed crack, the borehole wall is cooled again to re-open the crack, and temperature is measured when the crack is re-opened. The in-situ stress of the rock is calculated using a first cracking temperature at which the crack is formed and a second cracking temperature at which the crack is re-opened. Further, the apparatus cools, heats and re-cools the borehole wall, thereby measuring the first cracking temperature, the second cracking temperature, and the cracking point.
    Type: Application
    Filed: October 30, 2007
    Publication date: March 12, 2009
    Inventors: Chang-Ha Ryu, Dong-Woo Ryu, Byung-Hee Choi, Loui Porathur John, Joong-Ho Synn