Issued Patents 2019
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10508830 | High efficiency gas-fired water heater | Qian Zhang, Timothy D. Scott | 2019-12-17 |
| 10458678 | Apparatus and methods for heating water with refrigerant and phase change material | Qian Zhang | 2019-10-29 |