Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE46925 | Composite electrode for a plasma arc torch | David J. Cook, Charles M. Hackett, Yong Yang, Richard W. Couch, Jr., Zhipeng Lu | 2018-06-26 |
| 7659488 | Composite electrode for a plasma arc torch | David J. Cook, Charles M. Hackett, Yong Yang, Richard W. Couch, Jr., Zhipeng Lu | 2010-02-09 |
| 6841754 | Composite electrode for a plasma arc torch | David J. Cook, Charles M. Hackett, Young Sek Yang, Richard W. Couch, Jr., Zhipeng Lu | 2005-01-11 |