Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7059131 | Method and system for exchanging earth energy between earthly bodies and an energy exchanger, especially to produce an electric current | — | 2006-06-13 |
| 5937934 | Soil heat exchanger | — | 1999-08-17 |
| 5738164 | Arrangement for effecting an energy exchange between earth soil and an energy exchanger | — | 1998-04-14 |
| 5322115 | Installation for energy exchange between the ground and an energy exchanger | — | 1994-06-21 |