Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5603481 | Front packer for ram-type blowout preventer | Bruce G. Parker | 1997-02-18 |
| 5333832 | Blowout preventer with removable packer | Leroy E. Bartholomew, David Callahan | 1994-08-02 |
| 5294088 | Variable bore packer for a ram-type blowout preventer | David J. McWhorter | 1994-03-15 |
| 5005802 | Variable bore packer for a ram type blowout preventer | David J. McWhorter, Bolie C. Williams, III, Gary R. Schaeper | 1991-04-09 |
| 4313496 | Wellhead shearing apparatus | Friedrich E. Just | 1982-02-02 |