Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5230719 | Dehumidification apparatus | Rolf E. Berner | 1993-07-27 |
| 5050667 | Air ventilation and heat exchange apparatus | Rolf E. Berner | 1991-09-24 |
| 4744409 | Valve assembly for air treatment apparatus | — | 1988-05-17 |
| 4727931 | Air exchanging apparatus and method | — | 1988-03-01 |
| 4589476 | Air ventilation and filtration apparatus | — | 1986-05-20 |
| 4542782 | Rotary-type heat exchanger | — | 1985-09-24 |