Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5372016 | Ground source heat pump system comprising modular subterranean heat exchange units with multiple parallel secondary conduits | — | 1994-12-13 |
| 5339890 | Ground source heat pump system comprising modular subterranean heat exchange units with concentric conduits | — | 1994-08-23 |