Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5287879 | Hydraulically energized wireline blowout preventer | Henry H. Leggett, Russell C. Gilleylen | 1994-02-22 |
| 4938290 | Wireline blowout preventer having mechanical and hydraulic sealing | Henry H. Leggett | 1990-07-03 |