Patents Assigned to National Institute for Rural Engineering
  • Cement composition
    Patent number: 7070647
    Abstract: A novel cement is alkalescent, capable of solidifying a wide range of soil and applicable to biological environment. The cement composition contains 100 parts by weight of magnesium oxide, 5 to 25% by weight of at least one of silicic acid, alumina and iron oxide, 3 to 35 parts by weight of a phosphate, 2 to 30 parts by weight of gypsum and 0.005 to 7 parts by weight of a hydroxycarboxylic acid or a ketocarboxylic acid.
    Type: Grant
    Filed: February 21, 2001
    Date of Patent: July 4, 2006
    Assignee: National Institute for Rural Engineering
    Inventors: Shinsaku Fujimori, Shigeji Kobori