Patents Assigned to Promineral Gesellschaft zur Verwendung von Minerstoffen mbH
  • Method of making a hydraulic binder settable upon combination with water
    Patent number: 5273581
    Abstract: Calcium sulfate alpha hemihydrate and foundry sand are milled to cement fineness and form a hydraulic binder, as a mixture with both high early setting strength and excellent water resistance. The composition relies upon a sulfate activation of the foundry sand rather than an alkali activation thereof.
    Type: Grant
    Filed: June 23, 1989
    Date of Patent: December 28, 1993
    Assignees: Promineral Gesellschaft zur Verwendung von Minerstoffen mbH, Sicowa Verfahrenstechnik fur Baustoffe GmbH & Co. KG
    Inventors: Thomas Koslowski, Udo Ludwig, Alexander Frohlich