Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6668943 | Method and apparatus for controlling pressure and detecting well control problems during drilling of an offshore well using a gas-lifted riser | Torney M. Van Acker, Mark E. Ehrhardt | 2003-12-30 |
| 6578637 | Method and system for storing gas for use in offshore drilling and production operations | Mark E. Ehrhardt | 2003-06-17 |
| 6571873 | Method for controlling bottom-hole pressure during dual-gradient drilling | — | 2003-06-03 |
| 6328107 | Method for installing a well casing into a subsea well being drilled with a dual density drilling system | — | 2001-12-11 |
| 4282939 | Method and apparatus for compensating well control instrumentation for the effects of vessel heave | Jerry M. Speers, James D. Howell | 1981-08-11 |
| 4274283 | Apparatus and method for measuring fluid gel strength | George G. Binder, Jr. | 1981-06-23 |