Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5988158 | Outdoor oven apparatus | — | 1999-11-23 |
| 5071457 | Composite for filtering hot gas and method of its manufacture | James F. Zievers, Paul Eggerstedt | 1991-12-10 |
| 4741841 | Method and apparatus for particle separation | Earl A. Borre, James F. Zievers | 1988-05-03 |
| 4526688 | Pressure filter with vibratory impactor | Allen E. Cederholm, James F. Zievers | 1985-07-02 |
| 4446030 | Liquid circulation and pressure tanks | — | 1984-05-01 |
| 4391709 | Filter cake control method and apparatus | — | 1983-07-05 |
| 4289630 | Filter cake removal method and apparatus | Allen E. Cederholm, James F. Zievers | 1981-09-15 |
| 4247394 | Filter element and method of use | — | 1981-01-27 |