Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5039311 | Abrasive granules | — | 1991-08-13 |
| 4799939 | Erodable agglomerates and abrasive products containing the same | Ernest J. Duwell | 1989-01-24 |
| 4652275 | Erodable agglomerates and abrasive products containing the same | Ernest J. Duwell | 1987-03-24 |