Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7128152 | Method and apparatus to selectively reduce wellbore pressure during pumping operations | Steven L. Anyan, Stephane J. Virally, Vincent Rodet | 2006-10-31 |
| 7128160 | Method and apparatus to selectively reduce wellbore pressure during pumping operations | Steven L. Anyan, Stephane J. Virally | 2006-10-31 |