Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8672057 | Method for controlling loss of drilling fluid | Fred E. Dupriest, Sabine C. Zeilinger, Chinar R. Aphale | 2014-03-18 |
| 8393411 | Method for controlling loss of drilling fluid | Fred E. Dupriest, Sabine C. Zeilinger, Chinar R. Aphale | 2013-03-12 |
| 7681644 | Managing lost returns in a wellbore | John K. Montgomery, Stuart R. Keller, Nancy M. Krahel, Robert S. Williamson, III | 2010-03-23 |