Issued Patents All Time
Showing 101–124 of 124 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4574889 | Method and apparatus for locking a subsurface safety valve in the open position | — | 1986-03-11 |
| 4569398 | Subsurface well safety valve | — | 1986-02-11 |
| 4566540 | Hydraulically actuated control fluid communication nipple | William D. Eatwell | 1986-01-28 |
| 4562854 | Piston actuated chemical injection valve | Arthur J. Morris, John Johnson | 1986-01-07 |
| 4538838 | Method and apparatus of sealing threaded sections of a well tool | — | 1985-09-03 |
| 4538685 | Locking annulus safety valve | Paul Black | 1985-09-03 |
| 4534414 | Hydraulic control fluid communication nipple | — | 1985-08-13 |
| 4531581 | Piston actuated high temperature well packer | Arthur J. Morris | 1985-07-30 |
| 4527630 | Hydraulic actuating means for subsurface safety valve | — | 1985-07-09 |
| 4524831 | Hydraulic controlled well valve | — | 1985-06-25 |
| 4520870 | Well flow control device | — | 1985-06-04 |
| 4512411 | Fluid actuated energy charged well service line cutter | — | 1985-04-23 |
| 4510994 | Pump out sub | — | 1985-04-16 |
| 4495998 | Tubing pressure balanced well safety valve | — | 1985-01-29 |
| 4460046 | Control fluid communication nipple | — | 1984-07-17 |
| 4452310 | Metal-to-metal high/low pressure seal | William D. Eatwell | 1984-06-05 |
| 4444266 | Deep set piston actuated well safety valve | — | 1984-04-24 |
| 4373587 | Fluid displacement well safety valve | — | 1983-02-15 |
| 4368911 | Subsurface conduit setting and pulling tool | — | 1983-01-18 |
| 4362214 | Tubing retrievable variable setting differential pressure actuated well safety valve | Arthur J. Morris | 1982-12-07 |
| 4273194 | Annular flow control safety valve | Paul Black | 1981-06-16 |
| 4252197 | Piston actuated well safety valve | — | 1981-02-24 |
| 4248308 | Externally adjusted spring actuated well valve | — | 1981-02-03 |
| 4215748 | Lockout for a well injection valve | Clare A. Pace | 1980-08-05 |