Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6799638 | Method, apparatus and system for selective release of cementing plugs | — | 2004-10-05 |
| 6796377 | Anti-rotation apparatus for limiting rotation of cementing plugs | Henry E. Rogers, Earl Webb, Michael D. Stevens | 2004-09-28 |