|
| US3933447 | 8. Nov. 1974 | 20. Jan. 1976 | The United States of America as represented by the United States Energy Research and Development Administration | Underground gasification of coal |
| US3957305 | 11. Febr. 1974 | 18. Mai 1976 | Rapidex, Inc. | In situ values extraction |
| US4043596 | 11. Aug. 1975 | 23. Aug. 1977 | Occidental Oil Shale, Inc. | Forming shale oil recovery retort by blasting into slot-shaped columner void |
| US4106814 | 15. Juli 1977 | 15. Aug. 1978 | Occidental Oil Shale, Inc. | Method of forming in situ oil shale retorts |
| US4113313 | 16. Mai 1977 | 12. Sept. 1978 | In Situ Technology, Inc. | Recovering uranium from coal in situ |
| US4147388 | 5. Jan. 1978 | 3. Apr. 1979 | Occidental Oil Shale, Inc. | Method for in situ recovery of liquid and gaseous products from oil shale deposits |
| US4153299 | 23. Mai 1978 | 8. Mai 1979 | Golder Associates, Inc. | Combustion air supply to in-situ retorts |
| US4153300 | 23. Mai 1978 | 8. Mai 1979 | Golder Associates, Inc. | Recovery of fluid fuels by in-situ retorting of carbonaceous deposits |
| US4379593 | 19. Jan. 1981 | 12. Apr. 1983 | Multi Mineral Corporation | Method for in situ shale oil recovery |
| US4391467 | 10. Apr. 1981 | 5. Juli 1983 | The United States of America as represented by the United States Department of Energy | System for producing a uniform rubble bed for in situ processes |
