Issued Patents 2021
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11187127 | Exhaust gas treatment system and method with four-way catalyzed filter element | Ayyappan Ponnaiyan | 2021-11-30 |
| 11073067 | Exhaust gas treatment system and method with reductant injection and close-coupled treatment element | Danan Dou, Shyan-Cherng Huang | 2021-07-27 |
| 11022016 | Exhaust gas treatment system and method with improved regeneration | Shyan-Cherng Huang, Danan Dou | 2021-06-01 |