Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5279365 | Rotary blowout preventer adaptable for use with both kelly and overhead drive mechanisms | Glenn Yenulis | 1994-01-18 |
| 5277249 | Rotary blowout preventer adaptable for use with both kelly and overhead drive mechanisms | Glenn Yenulis | 1994-01-11 |