Patents Assigned to Sobu Ready Mix Concrete Co., Ltd.
  • Method of producing concrete
    Patent number: 4795263
    Abstract: A fine aggregate is stored in a high storage silo and its surface water content is so controlled that its variation may be kept within .+-.1% by weight. The fine aggregate, cement and primary water containing an air entraining agent are mixed in an upper mixer (primary mixing) to prepare mortar. The mortar, a coarse aggregate and secondary water containing a water reducing agent are mixed in a lower mixer (secondary mixing) to produce mixed concrete.
    Type: Grant
    Filed: February 12, 1985
    Date of Patent: January 3, 1989
    Assignees: Sumitomo Corporation, Sobu Ready Mix Concrete Co., Ltd.
    Inventor: Kikuo Kaga