Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6193073 | Paper stock screening apparatus and method | David E. Chupka, Peter Seifert | 2001-02-27 |
| 6053439 | Reducing wax content and enhancing quality of recycled pulp from OCC and waste paper | Ralph E. Locke, Gary N. Prentice | 2000-04-25 |
| 5582686 | High pressure water jet comminuting | David E. Chupka, Peter Seifert | 1996-12-10 |
| 5234172 | High pressure water jet comminuting | David E. Chupka, Peter Seifert | 1993-08-10 |
| 5064537 | Seamless screen cylinder with laser cut openings | David E. Chupka, Joseph P. Constiner | 1991-11-12 |
| 5022984 | Froth flotation apparatus and method | John J. Pimley, Irenee J. Phillippe, Paul G. Marsh | 1991-06-11 |