Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11585171 | Managed pressure drilling systems and methods | — | 2023-02-21 |
| 11441364 | Concentric pipe systems and methods | — | 2022-09-13 |
| 10865607 | Concentric pipe systems and methods | — | 2020-12-15 |
| 10745996 | Circulation valve | — | 2020-08-18 |
| 8844653 | Continuous circulating sub for drill strings | — | 2014-09-30 |
| 8534369 | Drill string flow control valve and methods of use | — | 2013-09-17 |
| 7992655 | Dual gradient drilling method and apparatus with multiple concentric drill tubes and blowout preventers | — | 2011-08-09 |
| 7992654 | Dual gradient drilling method and apparatus with an adjustable centrifuge | — | 2011-08-09 |
| 7762357 | Dual gradient drilling method and apparatus with an adjustable centrifuge | — | 2010-07-27 |
| 7584801 | Drill string flow control valves and methods | — | 2009-09-08 |
| 7093662 | System for drilling oil and gas wells using a concentric drill string to deliver a dual density mud | — | 2006-08-22 |
| 7090036 | System for drilling oil and gas wells by varying the density of drilling fluids to achieve near-balanced, underbalanced, or overbalanced drilling conditions | — | 2006-08-15 |
| 6966392 | Method for varying the density of drilling fluids in deep water oil and gas drilling applications | — | 2005-11-22 |
| 6926101 | System and method for treating drilling mud in oil and gas well drilling applications | — | 2005-08-09 |