Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12209026 | Nutrient recovery systems and methods | Quanbao Zhao, Stephen W. Dvorak, Shulin Chen, Craig Frear | 2025-01-28 |
| 10556804 | Nutrient recovery systems and methods | Quanbao Zhao, Stephen W. Dvorak, Shulin Chen, Craig Frear | 2020-02-11 |
| 8613894 | Nutrient recovery systems and methods | Quanbao Zhao, Stephen W. Dvorak, Shulin Chen, Craig Frear | 2013-12-24 |