Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884477 | Rotary drill bit with abrasion and erosion resistant facing | Craig H. Cooley | 1989-12-05 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884477 | Rotary drill bit with abrasion and erosion resistant facing | Craig H. Cooley | 1989-12-05 |