Issued Patents 2021
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11066291 | Flush and winterizing system | — | 2021-07-20 |
| 11047494 | Air admittance valve preventing mephitis overflow | Chao-Chi Chen | 2021-06-29 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11066291 | Flush and winterizing system | — | 2021-07-20 |
| 11047494 | Air admittance valve preventing mephitis overflow | Chao-Chi Chen | 2021-06-29 |