Issued Patents 2004
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6698538 | Drill bit having adjustable total flow area | Michael G. Azar, John (Youhe) Zhang | 2004-03-02 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6698538 | Drill bit having adjustable total flow area | Michael G. Azar, John (Youhe) Zhang | 2004-03-02 |