Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4848476 | Drill bit having offset roller cutters and improved nozzles | John D. Deane | 1989-07-18 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4848476 | Drill bit having offset roller cutters and improved nozzles | John D. Deane | 1989-07-18 |