Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4878403 | Manufacture of rotary drill bits | — | 1989-11-07 |
| 4873895 | Manufacture of rotary drill bits | Malcolm R. Taylor, John R. Smart | 1989-10-17 |
| 4862977 | Drill bit and cutter therefor | Terry R. Matthias, Malcolm R. Taylor | 1989-09-05 |
| 4804049 | Rotary drill bits | — | 1989-02-14 |