Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10221953 | Non chattering pressure relief valve | Geoffrey R. Zhang | 2019-03-05 |
| 9709182 | Non chattering pressure relief valve | Geoffrey R. Zhang | 2017-07-18 |
| 9303776 | Non chattering pressure relief valve | Geoffrey R. Zhang | 2016-04-05 |