Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5533355 | Subterranean heat exchange units comprising multiple secondary conduits and multi-tiered inlet and outlet manifolds | — | 1996-07-09 |
| 5477914 | Ground source heat pump system comprising modular subterranean heat exchange units with multiple parallel secondary conduits | — | 1995-12-26 |
| 5372016 | Ground source heat pump system comprising modular subterranean heat exchange units with multiple parallel secondary conduits | — | 1994-12-13 |
| 5339890 | Ground source heat pump system comprising modular subterranean heat exchange units with concentric conduits | — | 1994-08-23 |
| 5081848 | Ground source air conditioning system comprising a conduit array for de-icing a nearby surface | Michael E. Albertson | 1992-01-21 |
| 4753285 | Parallel piping installation with air by-pass apparatus | — | 1988-06-28 |
| 4574875 | Heat exchanger for geothermal heating and cooling systems | James R. Partin | 1986-03-11 |
| 4538673 | Drilled well series and paralleled heat exchange systems | James R. Partin | 1985-09-03 |