Patents Assigned to President of Kochi University
  • Blocking agent for rock cracks and method of blocking rock cracks
    Patent number: 5788421
    Abstract: Underground rock cracks are blocked by using a slurry of blocking agent containing hectorite raw materials in an amount of 1 to 10 wt %, which comprises an acidic precipitate of water glass and magnesium chloride, sodium hydroxide, and lithium hydroxide and water, through the steps of injecting the slurry, allowing the slurry to flow into the cracks produced in rocks, and allowing hectorite synthesized from the raw materials contained in the slurry to gel under high temperature conditions of underground.
    Type: Grant
    Filed: July 23, 1997
    Date of Patent: August 4, 1998
    Assignee: President of Kochi University
    Inventors: Shoji Higashi, Nakamichi Yamasaki, Hideaki Takahashi, deceased