Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5183269 | Unitized grit seal with removable thrust bumper | David D. Black | 1993-02-02 |
| 4336945 | Sinuous seal with auxiliary excluder lips | Keith W. Christiansen | 1982-06-29 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5183269 | Unitized grit seal with removable thrust bumper | David D. Black | 1993-02-02 |
| 4336945 | Sinuous seal with auxiliary excluder lips | Keith W. Christiansen | 1982-06-29 |