Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6406030 | O-ring seal with lubricant additives for rock bit bearings | Zhigang Fang, Robert Denton | 2002-06-18 |
| 6336512 | Drill bit having canted seal | Michael A. Siracki, Chris E. Cawthorne, Quan Nguyen | 2002-01-08 |