Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4830739 | Process and composition for the froth flotation beneficiation of iron minerals from iron ores | Martin Hellsten, Bo Idstrom | 1989-05-16 |
| 4795578 | Process and composition for the froth flotation beneficiation of iron minerals from iron ores | Martin Hellsten, Bo Idstrom | 1989-01-03 |