Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4746069 | Centrifugal media mill | Roy A. Nelson, Randolph C. Grieves | 1988-05-24 |
| 4634134 | Mechanical seal | — | 1987-01-06 |
| 4582266 | Centrifugal media mill | Roy A. Nelson, Randolph C. Grieves | 1986-04-15 |