|
| US3997425 | 26 Dec 1974 | 14 Dec 1976 | Universal Oil Products Company | Process for the liquefaction of coal |
| US4035281 | 5 Mar 1976 | 12 Jul 1977 | Mobil Oil Corporation | Production of fuel oil |
| US4052292 | 5 Mar 1976 | 4 Oct 1977 | Mobil Oil Corporation | Liquefaction of solid carbonaceous materials |
| US4094746 | 25 Nov 1974 | 13 Jun 1978 | United States Steel Corporation | Coal-conversion process |
| US4148709 | 27 Oct 1977 | 10 Apr 1979 | The Lummus Company | Hydroliquefaction of sub-bituminous and lignitic coals to heavy pitch |
| US4189373 | 24 Oct 1978 | 19 Feb 1980 | Director-General of Agency of Industrial Science and Technology | Process for the production of ashless liquid fuels |
| US4330390 | 14 Feb 1979 | 18 May 1982 | Chevron Research Company | Two-stage coal liquefaction process with petroleum-derived coal solvents |
| US4330393 | 6 Oct 1980 | 18 May 1982 | Chevron Research Company | Two-stage coal liquefaction process with petroleum-derived coal solvents |
| US4338183 | 14 Oct 1980 | 6 Jul 1982 | UOP Inc. | Method of solvent extraction of coal by a heavy oil |
| US4354920 | 9 Mar 1981 | 19 Oct 1982 | Chevron Research Company | Coal liquefaction process |
| US4379744 | 8 Sep 1981 | 12 Apr 1983 | Chevron Research Company | Coal liquefaction process |
| US4390409 | 5 Jun 1981 | 28 Jun 1983 | Mobil Oil Corporation | Co-processing of residual oil and coal |
| US4415429 | 22 Jul 1980 | 15 Nov 1983 | Rutgerswerke Aktiengesellschaft | Process for the preparation of highly aromatic pitchlike hydrocarbons |
| US4422922 | 26 Jul 1982 | 27 Dec 1983 | Chevron Research Company | Coal liquefaction and hydroprocessing of petroleum oils |
| US4430193 | 16 Jul 1981 | 7 Feb 1984 | Rutgerswerke Aktiengesellschaft | Process for dissolving coal in hydrocarbon mixtures |
| US4455215 | 29 Apr 1982 | 19 Jun 1984 | | Process for the geoconversion of coal into oil |
| US4510038 | 15 Oct 1982 | 9 Apr 1985 | Chevron Research Company | Coal liquefaction using vacuum distillation and an external residuum feed |
| US4552725 | 7 Feb 1983 | 12 Nov 1985 | Mobil Oil Corporation | Apparatus for co-processing of oil and coal |
