| 8230930 |
Mounts for blowout preventer bonnets and methods of use |
Michael Wayne Berckenhoff, William L. Carbaugh |
2012-07-31 |
| 7802626 |
Mounts for blowout preventer bonnets and methods of use |
Michael Wayne Berckenhoff, William L. Carbaugh |
2010-09-28 |
| 7699554 |
Removable seal carrier for blowout preventer bonnet assembly |
William Rinehart Holland, Jr., Michael Wayne Berckenhoff |
2010-04-20 |
| 7413019 |
Mounts for blowout preventer bonnets |
Michael Wayne Berckenhoff |
2008-08-19 |
| 7281586 |
Mounts for blowout preventer bonnets |
Michael Wayne Berckenhoff, William L. Carbaugh |
2007-10-16 |
| 7246666 |
Mounts for blowout preventer bonnets |
Michael Wayne Berckenhoff, William L. Carbaugh |
2007-07-24 |
| 7121348 |
Mounts for blowout preventer bonnets |
Michael Wayne Berckenhoff, William L. Carbaugh |
2006-10-17 |
| 7096960 |
Mounts for blowout preventer bonnets |
Michael Wayne Berckenhoff, William L. Carbaugh |
2006-08-29 |
| 6845959 |
Quick release blowout preventer bonnet |
Michael Wayne Berckenhoff, William Rinehart Holland, Jr. |
2005-01-25 |
| 6554247 |
Quick release blowout preventer bonnet |
Michael Wayne Berckenhoff |
2003-04-29 |
| 6510897 |
Rotational mounts for blowout preventer bonnets |
— |
2003-01-28 |