Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5078275 | Screening apparatus for paper making stock | David E. Chupka, Terry L. Bliss, Derald R. Hatton, Peter Seifert | 1992-01-07 |
| 4717471 | Apparatus for screening paper fiber stock | — | 1988-01-05 |
| 4663030 | Disk rotor for selectifier screen | David E. Chupka, Mark W. Gilkey, Larry D. Markham | 1987-05-05 |