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| US4123258 | 16 Ago 1977 | 31 Oct 1978 | Thyssen Niederrhein | Process for the production of steel with increased ductility and for the desulfurization of a steel melt |
| US4162159 | 18 Abr 1978 | 24 Jul 1979 | | Cast iron modifier and method of application thereof |
| US4194902 | 12 Sep 1978 | 25 Mar 1980 | SKW Trostberg Aktiengesellschaft | Desulfurization agent for ferrous melts and method of using the same |
| USRE31676 | 29 Sep 1982 | 18 Sep 1984 | Thyssen Aktiengesellschaft vorm August Thyssen-Hutte AG | Method and apparatus for dispensing a fluidizable solid from a pressure vessel |
