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| Number | Title | Issue Date |
| 6352108 | Well pipe The invention is a well pipe with longitudinal rods arranged in intervals in the pipe wall over the whole circumference. It is characterized by the fact that the well pipe is made of polymer concrete, and of an additional layer of packed gravel functionin... | 03/05/2002 |
| 5645614 | Process for the utilization of sewage sludges In the process, the wet sewage sludge originating from a preceding mechanical dewatering is mixed with brown coal, brown coal coke or their mixtures in a weight ratio of sewage sludge to brown coal or its mixtures with brown coal coke of 1:3 to 3:1 and su... | 07/08/1997 |
| 5144317 | Method of determining mining progress in open cast mining by means of satellite geodesy In a method of determining mining progress and the mined masses in open cast mining the position and orientation of the extraction device such as a bucket wheel of a travelling excavator are ascertained by means of satellite geodesy using a receiver in th... | 09/01/1992 |
