| Patents for C22B 25 - Obtaining tin (604) | |
|---|---|
| 05/1977 | |
| 05/24/1977 | US4025335 Method for the recovery of useful metallic components |
| 04/1977 | |
| 04/12/1977 | US4017369 Or snantimony, arsenic, mercury, tin |
| 08/1976 | |
| 08/24/1976 | US3976472 Method and an electrically heated device for producing molten metal from powders or lumps of metal oxides |
| 04/1976 | |
| 04/06/1976 | US3948495 Apparatus for continuous vacuum-refining of metals |