Issued Patents 2002
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6499547 | Multiple grade carbide for diamond capped insert | Marcus Skeem | 2002-12-31 |
| 6450271 | Surface modifications for rotary drill bits | Gordon A. Tibbitts, James L. Overstreet, Terry J. Kolterman, Chih Lin, James Andy Oxford +1 more | 2002-09-17 |
| 6374704 | Steel-tooth bit with improved toughness | James L. Overstreet, Anton F. Zahradnik | 2002-04-23 |