Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11156054 | Annular blowout preventer | John L. Alsup, J. GILBERT NANCE, Erik Norbom, THOR ARNE HAVERSTAD | 2021-10-26 |
| 10519739 | Ram for a blowout preventer and a blowout preventer provided with rams | THOR ARNE HAVERSTAD, Erik Norbom, J. GILBERT NANCE, John L. Alsup | 2019-12-31 |
| 6719262 | Bidirectional sealing blowout preventer | Melvyn F. Whitby, Paul L. Tasson | 2004-04-13 |
| 5005802 | Variable bore packer for a ram type blowout preventer | David J. McWhorter, Eric G. Childs, Gary R. Schaeper | 1991-04-09 |
| 4969390 | Rod locking device | — | 1990-11-13 |
| 4579314 | Annular blowout preventer | Gary R. Schaeper, William M. Taylor | 1986-04-01 |
| 4541639 | Ram-type blowout preventer with improved ram front packer | — | 1985-09-17 |
| 4508312 | Ram-type blowout preventer | William M. Taylor | 1985-04-02 |
| 4508311 | Annular blowout preventer | Friedrich E. Just | 1985-04-02 |
| 4460150 | Annular blowout preventer | Robert J. Turlak, Gary R. Schaeper | 1984-07-17 |
| 4460151 | Annular blowout preventer | Richard M. Church, Jr. | 1984-07-17 |
| 4458876 | Annular blowout preventer | Gary R. Schaeper | 1984-07-10 |
| 4310139 | Annular blowout preventer | Richard M. Church, Jr. | 1982-01-12 |
| 4229012 | Variable bore packer assembly for ram-type blowout preventers | — | 1980-10-21 |