Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7017650 | Earth loop energy systems | Howard E. Johnson, Jr., Gregory Tinkler | 2006-03-28 |
| 6860320 | Bottom member and heat loops | Howard E. Johnson, Jr. | 2005-03-01 |
| 6672371 | Earth heat exchange system | Howard E. Johnson, Jr. | 2004-01-06 |
| 6585036 | Energy systems | Howard E. Johnson, Jr. | 2003-07-01 |
| 6276438 | Energy systems | Howard E. Johnson, Jr. | 2001-08-21 |
| 6250371 | Energy transfer systems | Howard E. Johnson, Jr. | 2001-06-26 |
| 6041862 | Ground heat exchange system | — | 2000-03-28 |
| 5758724 | Underground heat exchange system | — | 1998-06-02 |
| 5590715 | Underground heat exchange system | — | 1997-01-07 |