Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5954849 | Filter element | James L. Berkhoel, Dolan Bartels | 1999-09-21 |
| 5803941 | Filter element | James L. Berkhoel, Dolan Bartels, Bruce Johnson, Steven D. Schmeichel | 1998-09-08 |