| 8047294 |
Dual flapper safety valve |
James Dan Vick, Jr., James M. Williams |
2011-11-01 |
| 7798229 |
Dual flapper safety valve |
James Dan Vick, Jr., James M. Williams |
2010-09-21 |
| 6302210 |
Safety valve utilizing an isolation valve and method of using the same |
Robert W. Crow, Michael Wade Meaders, Gerald L. LeBoeuf |
2001-10-16 |
| 4834183 |
Surface controlled subsurface safety valve |
Craig D. Hines, Rennie L. Dickson, Robert C. Hammett |
1989-05-30 |
| 4723606 |
Surface controlled subsurface safety valve |
Phillip S. Sizer, Ronald K. Churchman, Rennie L. Dickson, Roddie R. Smith |
1988-02-09 |
| RE32343 |
Well safety valve |
Steven C. Speegle, Michael Wade Meaders, Robert L. Hilts |
1987-02-03 |
| 4469179 |
Safety system |
Robert W. Crow, Kenneth L. Schwendemann |
1984-09-04 |
| 4461353 |
Well safety valve |
Steven C. Speegle, Michael Wade Meaders, Robert L. Hilts |
1984-07-24 |
| 4452311 |
Equalizing means for well tools |
Steven C. Speegle, Vinson D. Sullivan |
1984-06-05 |
| 4448216 |
Subsurface safety valve |
Steven C. Speegle, Kenneth L. Schwendemann, Robert W. Crow, Cary Gorten Mondon |
1984-05-15 |