Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5099932 | Rock drill bit lubricant circulating system | — | 1992-03-31 |
| 4914268 | Beam welding process | Clinton J. Wohlmuth | 1990-04-03 |
| 4874047 | Method and apparatus for retaining roller cone of drill bit | — | 1989-10-17 |