Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6820695 | Snap-lock seal for seal valve assembly | Michael D. Stevens, Aimee Greening | 2004-11-23 |
| 6796377 | Anti-rotation apparatus for limiting rotation of cementing plugs | Charles Butterfield, Henry E. Rogers, Michael D. Stevens | 2004-09-28 |
| 6772835 | Apparatus and method for disconnecting a tail pipe and maintaining fluid inside a workstring | Henry E. Rogers, Michael Dodson, David D. Szarka, Frank Acosta | 2004-08-10 |