Issued Patents All Time
Showing 126–141 of 141 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6186227 | Packer | Vladimir Vaynshteyn, James D. Hendrickson, Jim B. Benton, Raghu Madhavan, Mitchell G. Willcox | 2001-02-13 |
| 6102120 | Zone isolation tools | Kuo-Chiang Chen, Haoshi Song, Jack F. Lands, Jr., Wallace E. Voreck | 2000-08-15 |
| 6085845 | Surface controlled formation isolation valve adapted for deployment of a desired length of a tool string in a wellbore | Gary L. Rytlewski | 2000-07-11 |
| 6041864 | Well isolation system | Christian C. Spring | 2000-03-28 |
| 6024173 | Inflatable shifting tool | Mike Griffith | 2000-02-15 |
| 5957206 | Plug for operating a downhole device using tubing pressure | — | 1999-09-28 |
| 5950733 | Formation isolation valve | — | 1999-09-14 |
| 5819853 | Rupture disc operated valves for use in drill stem testing | — | 1998-10-13 |
| 5810087 | Formation isolation valve adapted for building a tool string of any desired length prior to lowering the tool string downhole for performing a wellbore operation | — | 1998-09-22 |
| 5765916 | Memory seat with soft and hard travel limits | — | 1998-06-16 |
| 5687795 | Packer locking apparatus including a time delay apparatus for locking a packer against premature setting when entering a liner in a wellbore | Ervin Randermann, Jr. | 1997-11-18 |
| 5337827 | Pressure-controlled well tester adapted to be selectively retained in a predetermined operating position | Joe C. Hromas | 1994-08-16 |
| 5303872 | Transportable battery disposal unit | Marvin Milewits, Baldemar Fuentes | 1994-04-19 |
| 5275241 | Circulating valve apparatus and drill stem test method allowing selective fluid communication between an above packer annulus and a rathole | Andrew W. Vigor, Adrian J. Stewart | 1994-01-04 |
| 4923010 | Mud solids immune clean fluid compensating system | James M. Upchurch | 1990-05-08 |
| 4886117 | Inflatable well packers | — | 1989-12-12 |