Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4705122 | Cutter assemblies for rotary drill bits | David N. Shirley-Fisher | 1987-11-10 |
| 4699227 | Method of forming cutting structures for rotary drill bits | — | 1987-10-13 |
| 4679639 | Rotary drill bits and cutting elements for such bits | John D. Barr | 1987-07-14 |