Issued Patents 2004
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6810958 | Circulating cementing collar and method | David D. Szarka | 2004-11-02 |
| 6796377 | Anti-rotation apparatus for limiting rotation of cementing plugs | Charles Butterfield, Earl Webb, Michael D. Stevens | 2004-09-28 |
| 6772835 | Apparatus and method for disconnecting a tail pipe and maintaining fluid inside a workstring | Michael Dodson, Earl Webb, David D. Szarka, Frank Acosta | 2004-08-10 |
| 6758281 | Methods and apparatus for creating a downhole buoyant casing chamber | Bobby L. Sullaway | 2004-07-06 |