Issued Patents All Time
Showing 25 most recent of 29 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6991040 | Method and apparatus for locking out a subsurface safety valve | Thomas G. Hill, Jr., Neil A. A. Simpson, Rory L. Hodge | 2006-01-31 |
| 6854519 | Subsurface valve with system and method for sealing | Winfield M. Sides, III, Robert Jancha, Roddie R. Smith | 2005-02-15 |
| 6666271 | Curved flapper and seat for a subsurface saftey valve | Robert Jancha | 2003-12-23 |
| 6575249 | Apparatus and method for locking open a flow control device | — | 2003-06-10 |
| 6513594 | Subsurface safety valve | David McCalvin | 2003-02-04 |
| 6478090 | Method and apparatus of operating devices using actuators having expandable or contractable elements | — | 2002-11-12 |
| 6433991 | Controlling activation of devices | Dwayne Leismer, Dennis M. Read, Jr. | 2002-08-13 |
| 6321845 | Apparatus for device using actuator having expandable contractable element | — | 2001-11-27 |
| 6315047 | Eccentric subsurface safety valve | Jason C. Mailand | 2001-11-13 |
| 6283217 | Axial equalizing valve | — | 2001-09-04 |
| 6241022 | Control line connector | Jason C. Mailand | 2001-06-05 |
| 6237693 | Failsafe safety valve and method | — | 2001-05-29 |
| 6098714 | Hydraulic fluid actuator with metal to metal seals | — | 2000-08-08 |
| 6053251 | Reduced travel operating mechanism for downhole tools | — | 2000-04-25 |
| 5293551 | Monitor and control circuit for electric surface controlled subsurface valve system | Donald H. Perkins | 1994-03-08 |
| 5211243 | Annulus safety valve | Scott C. Strattan | 1993-05-18 |
| 5207275 | Annulus safety valve | Scott C. Strattan | 1993-05-04 |
| 5070595 | Method for manufacturing electric surface controlled subsurface valve system | Donald H. Perkins | 1991-12-10 |
| 4981173 | Electric surface controlled subsurface valve system | Donald H. Perkins | 1991-01-01 |
| 4886114 | Electric surface controlled subsurface valve system | Donald H. Perkins, Phillip S. Sizer | 1989-12-12 |
| 4798247 | Solenoid operated safety valve and submersible pump system | Donald H. Perkins | 1989-01-17 |
| 4708163 | Safety valve | — | 1987-11-24 |
| 4664195 | Safety valve | — | 1987-05-12 |
| 4632187 | Well safety and kill valve | — | 1986-12-30 |
| 4566478 | Well safety and kill valve | — | 1986-01-28 |