Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5829539 | Rotary drill bit with hardfaced fluid passages and method of manufacturing | Alex Newton, John D. Deane, Douglas Caraway, Andrew Murdock, Michael Barnes | 1998-11-03 |
| 5819862 | Downhole components for use in subsurface drilling | Terry R. Matthias, John Hayward | 1998-10-13 |
| 4711144 | Drill bit and method of manufacture | John D. Barr | 1987-12-08 |
| 4605157 | Drill bit manufacturing method | John D. Barr | 1986-08-12 |