Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6705113 | Olefin plant refrigeration system | Qi Ma, James Tzong-Chaur Wu, Charles Sumner | 2004-03-16 |
| 6637237 | Olefin plant refrigeration system | Qi Ma, James Tzong-Chaur Wu | 2003-10-28 |
| 5979177 | Ethylene plant refrigeration system | Charles Sumner, John J. Crawford, Stephen J. Stanley, Richard John McNab | 1999-11-09 |