Issued Patents 2003
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6651748 | Methods and apparatus for creating a downhole buoyant casing chamber | Bobby L. Sullaway | 2003-11-25 |
| 6622798 | Method and apparatus for maintaining a fluid column in a wellbore annulus | Harold O. Treece, Grant Lynn Hartman | 2003-09-23 |
| 6547007 | PDF valve | David D. Szarka | 2003-04-15 |
| 6513598 | Drillable floating equipment and method of eliminating bit trips by using drillable materials for the construction of shoe tracks | Seth Richard MOORE | 2003-02-04 |
| 6505685 | Methods and apparatus for creating a downhole buoyant casing chamber | Bobby L. Sullaway | 2003-01-14 |