Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5902977 | Flotation cell and method | — | 1999-05-11 |
| 5807479 | Process for recovering copper from copper-containing material | — | 1998-09-15 |
| 5795465 | Process for recovering copper from copper-containing material | — | 1998-08-18 |
| 5074994 | Sequential and selective flotation of sulfide ores | Harold M. Ray | 1991-12-24 |
| 4382856 | Recovery of tin | — | 1983-05-10 |
| 4331635 | Recovery of copper and/or nickel and/or zinc | Martin Kuhn | 1982-05-25 |