Patents Examined by Anthoy McFarlane
  • Upgrading method of low-rank coal
    Patent number: 4461627
    Abstract: A coal is finely pulverized. The finely pulverized coal is subjected to dry distillation. A tar obtained by the dry distillation is added to an aqueous slurry together with the dry-distilled coal to effect the submerged granulation.
    Type: Grant
    Filed: December 13, 1982
    Date of Patent: July 24, 1984
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Yokoyama, Toshio Kuge, Shunsuke Nogita, Yoichi Nakamura