Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5816314 | Geothermal heat exchange unit | B. Ryland Wiggs, William C. Bickford, John Errington Hawk | 1998-10-06 |
| 5671608 | Geothermal direct expansion heat pump system | B. Ryland Wiggs, William C. Bickford | 1997-09-30 |