Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8440290 | Contact media for evaporative coolers | Galen W. Hartman | 2013-05-14 |
| 5408838 | Method and apparatus for conditioning unrecycled ambient air | Gary D. Wolf | 1995-04-25 |
| 4940475 | Variable capacity evaporative humidifier | — | 1990-07-10 |
| 4321797 | Quick connector and shut-off valve assembly for heat recovery system | Gerald W. Keller | 1982-03-30 |
| 4316367 | Heat recovery and hot water circulation system | Gerald W. Keller | 1982-02-23 |
| 4226606 | Waste heat recovery system | Gerald W. Keller | 1980-10-07 |