Patents Assigned to Lausitzer Braunkohle
  • Filter for holding and raising ground water
    Patent number: 6372135
    Abstract: The invention relates to a filter in which dust-containing silica sand is held together by a polyurethane binder, the polyurethane binder containing an organotin compound with a molecular weight of more than 600 as catalyst and a mixture of highly dispersed silica and/or bentonites with a thickened aluminosilicate as modifier. The filter is particularly suitable for the production of drinking water from ground water in surface mining regions.
    Type: Grant
    Filed: November 6, 1997
    Date of Patent: April 16, 2002
    Assignees: Henkel Kommanditgesellschaft auf Aktien, Lausitzer Braunkohle
    Inventors: Hans-Peter Kohlstadt, Klaus Marten, Lothar Thiele, Werner Fahle, Rainer Tost, Annebärbel Tost, Peter Tost, Frank Tost