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专利名称：Filter for holding and raising ground water发明人：Hans-Peter Kohlstadt,Klaus Marten,Lothar
Thiele,Werner Fahle,Rainer Tost,AnnebärbelTost,Peter Tost,Frank Tost
申请号：US067255申请日：19971106公开号：US06372135B1公开日：20020416
摘要：The invention relates to a filter in which dust-containing silica sand is heldtogether by a polyurethane binder, the polyurethane binder containing an organotincompound with a molecular weight of more than 600 as catalyst and a mixture of highlydispersed silica and/or bentonites with a thickened aluminosilicate as modifier. The filteris particularly suitable for the production of drinking water from ground water in surfacemining regions.
申请人：HENKEL KOMMANDITGESELLSCHAFT AUF AKTIEN,LAUSITZER BRAUNKOHLE
代理人：Wayne C. Jaeschke,Stephen D. Harper,Peter DeLuca
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