Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7017650 | Earth loop energy systems | Howard E. Johnson, Jr., Thomas R. Amerman | 2006-03-28 |
| 6694766 | Power generation systems with earth heat transfer | Howard E. Johnson, Jr. | 2004-02-24 |