Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6655478 | Fracture and wear resistant rock bits | Dah-Ben Liang, Gary R. Portwood, John L. Williams | 2003-12-02 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6655478 | Fracture and wear resistant rock bits | Dah-Ben Liang, Gary R. Portwood, John L. Williams | 2003-12-02 |