Issued Patents All Time
Showing 76–90 of 90 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6651748 | Methods and apparatus for creating a downhole buoyant casing chamber | Bobby L. Sullaway | 2003-11-25 |
| 6622798 | Method and apparatus for maintaining a fluid column in a wellbore annulus | Harold O. Treece, Grant Lynn Hartman | 2003-09-23 |
| 6547007 | PDF valve | David D. Szarka | 2003-04-15 |
| 6513598 | Drillable floating equipment and method of eliminating bit trips by using drillable materials for the construction of shoe tracks | Seth Richard MOORE | 2003-02-04 |
| 6505685 | Methods and apparatus for creating a downhole buoyant casing chamber | Bobby L. Sullaway | 2003-01-14 |
| 6318472 | Hydraulic set liner hanger setting mechanism and method | Charles Butterfield, David D. Szarka | 2001-11-20 |
| 6182766 | Drill string diverter apparatus and method | Wesley G. Duke, Millard L. Hallman, Tommy Stewart | 2001-02-06 |
| 6082459 | Drill string diverter apparatus and method | Donald F. Hushbeck | 2000-07-04 |
| 5829526 | Method and apparatus for placing and cementing casing in horizontal wells | David F. Laurel, Earl Webb, Grant Lynn Hartman, Kenneth G. Neal | 1998-11-03 |
| 5823273 | Well stabilization tools and methods | Krishna M. Ravi, Robert M. Beirute, Alan B. Duell, Dick A. Murray, Earl Webb | 1998-10-20 |
| 5711375 | Well stabilization tools and methods | Krishna M. Ravi, Robert M. Beirute, Alan B. Duell, Dick A. Murray, Earl Webb | 1998-01-27 |
| 5647434 | Floating apparatus for well casing | Bobby L. Sullaway, Dick A. Murray | 1997-07-15 |
| 5641021 | Well casing fill apparatus and method | Dick A. Murray, Bobby L. Sullaway, Earl Webb | 1997-06-24 |
| 5564500 | Apparatus and method for removing gelled drilling fluid and filter cake from the side of a well bore | Dick A. Murray, Earl Webb | 1996-10-15 |
| 5472053 | Leakproof floating apparatus and method for fabricating said apparatus | Bobby L. Sullaway, Dick A. Murray | 1995-12-05 |