Number | Date | Country | Kind |
---|---|---|---|
PI 8703766 | Jul 1987 | BRX |
Number | Name | Date | Kind |
---|---|---|---|
3930842 | Ryss et al. | Jan 1976 | |
3972710 | Meyer | Aug 1976 | |
3976475 | Markland | Aug 1976 | |
4058393 | McLaughlin | Nov 1977 | |
4302243 | Tamaru et al. | Nov 1981 | |
4309389 | Meyer | Jan 1982 | |
4446116 | Krismer et al. | May 1984 | |
4451438 | Floeter et al. | May 1984 | |
4673554 | Niwa et al. | Jun 1987 |
Number | Date | Country |
---|---|---|
55-113807 | Sep 1980 | JPX |
Entry |
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S. L. May et al., "Separation of Tantalum From Columbium by the Hydrofluoric Acid Sulfuric Acid-Methyl Isobutyl Ketone System", (1961), pp. 1-31. |
Joseph R. Werning et al., "Tantalum and Niobium--Separation by Liquid-Liquid Extraction", Industrial & Engineering Chemistry, (1954), pp. 2491-2494. |