Issued Patents All Time
Showing 1–19 of 19 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6991046 | Expandable eccentric reamer and method of use in drilling | Gary Wells, Rogerio H. Silva, William Christian Herben | 2006-01-31 |
| 6913098 | Sub-reamer for bi-center type tools | Rogerio H. Silva | 2005-07-05 |
| 6629476 | Bi-center bit adapted to drill casing shoe | Rogerio H. Silva | 2003-10-07 |
| 6412579 | Two stage drill bit | — | 2002-07-02 |
| 6401845 | Cutting element with stress reduction | — | 2002-06-11 |
| 6340064 | Bi-center bit adapted to drill casing shoe | Rogerio H. Silva | 2002-01-22 |
| 6315067 | Cutting element with stress reduction | — | 2001-11-13 |
| 6142248 | Reduced erosion nozzle system and method for the use of drill bits to reduce erosion | Gary M. Thigpen, Henry P. Rebollido, Jr., Brad Weston | 2000-11-07 |
| 6068072 | Cutting element | Alain Besson, Gary M. Thigpen | 2000-05-30 |
| 6026919 | Cutting element with stress reduction | Gary M. Thigpen, Brad Weston | 2000-02-22 |
| 5992548 | Bi-center bit with oppositely disposed cutting surfaces | Roger Silva, Brad Weston, Henry P. Rebollido, Jr. | 1999-11-30 |
| 5979577 | Stabilizing drill bit with improved cutting elements | — | 1999-11-09 |
| 5803196 | Stabilizing drill bit | — | 1998-09-08 |
| 5678644 | Bi-center and bit method for enhancing stability | — | 1997-10-21 |
| 5558170 | Method and apparatus for improving drill bit stability | Gary M. Thigpen, William H. Sherwood, Jr. | 1996-09-24 |
| 5449048 | Drill bit having chip breaker polycrystalline diamond compact and hard metal insert at gauge surface | Gary M. Thigpen, William H. Sherwood, Jr. | 1995-09-12 |
| 4351401 | Earth-boring drill bits | — | 1982-09-28 |
| 4336850 | Internal fluid screen to prevent nozzle and port plugging | — | 1982-06-29 |
| 4244432 | Earth-boring drill bits | David S. Rowley, Bruce H. Walker | 1981-01-13 |