Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6810958 | Circulating cementing collar and method | Henry E. Rogers | 2004-11-02 |
| 6772835 | Apparatus and method for disconnecting a tail pipe and maintaining fluid inside a workstring | Henry E. Rogers, Michael Dodson, Earl Webb, Frank Acosta | 2004-08-10 |
| 6725935 | PDF valve | Hank Rogers | 2004-04-27 |