Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6622496 | External loop nonfreezing heat exchanger | Alan Cheng | 2003-09-23 |
| 5937656 | Nonfreezing heat exchanger | Alan Cheng | 1999-08-17 |
| 5802858 | Cryogenic cooling tower | Alan Cheng | 1998-09-08 |
| 5701745 | Cryogenic cold shelf | Alan Cheng | 1997-12-30 |
| 4848094 | Droplet freezing method and apparatus | Robert B. Davis | 1989-07-18 |