Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7810353 | Heat pump system with multi-stage compression | William J. Hutzel, Stefan Bertsch, David B. Bouffard | 2010-10-12 |
| 7654104 | Heat pump system with multi-stage compression | William J. Hutzel, Stefan Bertsch, David B. Bouffard | 2010-02-02 |