Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4574875 | Heat exchanger for geothermal heating and cooling systems | John P. Rawlings | 1986-03-11 |
| 4538673 | Drilled well series and paralleled heat exchange systems | John P. Rawlings | 1985-09-03 |
| 4257239 | Earth coil heating and cooling system | James E. Bose, Carl W. Ledbetter | 1981-03-24 |