Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6161632 | Purging means for purging upwards in ring spacing between drill pipe and bore hole wall | — | 2000-12-19 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6161632 | Purging means for purging upwards in ring spacing between drill pipe and bore hole wall | — | 2000-12-19 |