Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7228696 | Hybrid heating and cooling system | Rex K. Ambs, Thomas G. Kiessel, James V. Holstine | 2007-06-12 |
| 5983660 | Defrost subcircuit for air-to-air heat pump | Thomas G. Kiessel, Rex K. Ambs | 1999-11-16 |
| 5937665 | Geothermal subcircuit for air conditioning unit | Thomas G. Kiessel, Rex K. Ambs | 1999-08-17 |