Issued Patents All Time
Showing 26–41 of 41 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7080524 | Alternate sub-surface and optionally accessible direct expansion refrigerant flow regulating device | — | 2006-07-25 |
| 6971248 | Method and apparatus for inhibiting ice accumulation in HVAC systems | — | 2005-12-06 |
| 6932149 | Insulated sub-surface liquid line direct expansion heat exchange unit with liquid trap | — | 2005-08-23 |
| 6931879 | Closed loop direct expansion heating and cooling system with auxiliary refrigerant pump | — | 2005-08-23 |
| 6789608 | Thermally exposed, centrally insulated geothermal heat exchange unit | — | 2004-09-14 |
| 6751974 | Sub-surface and optionally accessible direct expansion refrigerant flow regulating device | — | 2004-06-22 |
| 6615601 | Sealed well direct expansion heating and cooling system | — | 2003-09-09 |
| 5946928 | Mini tube and direct expansion heat exchange system | — | 1999-09-07 |
| 5816314 | Geothermal heat exchange unit | Jack L. Womack, William C. Bickford, John Errington Hawk | 1998-10-06 |
| 5671608 | Geothermal direct expansion heat pump system | Jack L. Womack, William C. Bickford | 1997-09-30 |
| 5623986 | Advanced in-ground/in-water heat exchange unit | — | 1997-04-29 |
| 5419135 | Space-based power generator | — | 1995-05-30 |
| 5272879 | Multi-system power generator | — | 1993-12-28 |
| 5224357 | Modular tube bundle heat exchanger and geothermal heat pump system | Mike P. Galiyano, Mark Galiyano, Jeffrey T. Aspacher | 1993-07-06 |
| 4725195 | Advanced piggyback water power generator | — | 1988-02-16 |
| 4590386 | Piggy back water power generator | — | 1986-05-20 |