Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8561730 | Foot valve assembly for a down hole drill | Jing James Yao, Paul Campbell, Dale R. Wolfer, Timothy J. Plunkett | 2013-10-22 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8561730 | Foot valve assembly for a down hole drill | Jing James Yao, Paul Campbell, Dale R. Wolfer, Timothy J. Plunkett | 2013-10-22 |