Issued Patents 1994
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5289889 | Roller cone core bit with spiral stabilizers | Marvin Gearhart, Paul G. Parys | 1994-03-01 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5289889 | Roller cone core bit with spiral stabilizers | Marvin Gearhart, Paul G. Parys | 1994-03-01 |