Issued Patents 2023
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11770154 | Device and system for preventing drowning | Teng Zhang, Hai Xu | 2023-09-26 |
| 11694537 | Warning device, warning system for detecting water level in drainage well | Hai Xu | 2023-07-04 |