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| Patents for C01G 27 - Compounds of hafnium (508) |
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| 05/29/1979 | US4156641 Catalytic oxidation of mercaptan in petroleum distillate including quaternary ammonium hydroxide | | 03/20/1979 | US4145403 Arc heater method for producing metal oxides | | 11/07/1978 | US4124493 Catalytic oxidation of mercaptan in petroleum distillate including alkaline reagent and substituted ammonium halide | | 06/27/1978 | CA1033537A1 Separation process of zirconium and hafnium tetrachlorides and their mixtures | | 01/10/1978 | US4067953 Process for upgrading ores containing baddeleyite | | 05/03/1977 | US4021531 Process for the separation of zirconium and hafnium tetrachlorides from mixtures thereof | | 06/29/1976 | US3966458 Tetrachlorides by distillation of a eutectic mixture of sodium and potassium chlorides | | 05/11/1976 | US3956461 Orthorhombic rare earth Hf and Zr sulfides and selenides |
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