Patents Assigned to Koal, Inc.
  • Stable coal-water suspensions and their preparation
    Patent number: 4435306
    Abstract: A non-settling, coal-water slurry stabilized with an alkali metal soap of a fatty acid. The soap stabilizing agent is preferably prepared by saponification of a fat or fatty oil of either animal or vegetable origin and is diluted with water to the desired concentration without separation of by-products such as glycerine. Thereafter, pulverized coal is added with mixing to form a pumpable slurry which is non-settling at temperatures below the soap gel point.
    Type: Grant
    Filed: November 2, 1981
    Date of Patent: March 6, 1984
    Assignee: Koal, Inc.
    Inventor: Geza L. Kovacs