Issued Patents 2018
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D811580 | Unidirectional valve for face mask | Ee Ho Tang, Kwok Jiang Sak | 2018-02-27 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D811580 | Unidirectional valve for face mask | Ee Ho Tang, Kwok Jiang Sak | 2018-02-27 |