Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887677 | Low pressure drill bit | Suzanne M. Behr | 1989-12-19 |
| 4881605 | Stabilizing and drilling apparatus and method | Warren J. Winters, Jame F. Brett | 1989-11-21 |
| 4871037 | Excavation apparatus, system and method | Warren J. Winters | 1989-10-03 |
| 4862974 | Downhole drilling assembly, apparatus and method utilizing drilling motor and stabilizer | Warren J. Winters, James F. Brett | 1989-09-05 |
| 4854397 | System for directional drilling and related method of use | Warren J. Winters | 1989-08-08 |
| 4815342 | Method for modeling and building drill bits | James F. Brett, Lawrence Allen Sinor | 1989-03-28 |