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| US4001382 | 20 Ene 1975 | 4 Ene 1977 | Japan Exlan Company Limited | Process for producing carbon fibers having excellent physical properties |
| US4060650 | 24 Jun 1976 | 29 Nov 1977 | Kureha Kagaku Kogyo Kabushiki Kaisha | Method for preventing or eliminating water-absorption whitening of a molded article containing an acrylonitrile polymer or copolymer |
| US4507257 | 7 Mar 1983 | 26 Mar 1985 | Hoechst Aktiengesellschaft | Process for preparing acrylic filaments and fibers |
| US4524041 | 7 Mar 1983 | 18 Jun 1985 | Hoechst Aktiengesellschaft | Processes for preparing thermostable fibers and filaments |
