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| Number | Title | Issue Date |
| 5937934 | Soil heat exchanger A soil heat exchanger for effecting an energy exchange between earth soil and an energy exchanger and including a thermoinsulated flow duct arranged in a borehole formed in ground, a pump provided at an end of the flow duct, a shroud pipe surrounding the ... | 08/17/1999 |
| 5738164 | Arrangement for effecting an energy exchange between earth soil and an energy exchanger An arrangement for effecting an energy exchange between earth soil and an energy exchanger, and including a soil heat exchanger, and supply and return flow conduits for connecting the soil heat exchanger with the energy heat exchanger, with the soil heat ... | 04/14/1998 |
