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US4623444A
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Upgrading shale oil by a combination process
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US4605489A
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Upgrading shale oil by a combination process
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US4560205A
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Method for control of geometry of fragmented mass in an situ oil shale retort
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US4531783A
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Stability control in underground workings adjacent an in situ oil shale retort
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US4533181A
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Method for forming uniform flow rubble bed
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US4595056A
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Method for fully retorting an in situ oil shale retort
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US4552409A
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In situ oil shale retort with controlled permeability for uniform flow
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US4611856A
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Two-level, horizontal free face mining system for in situ oil shale retorts
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US4560206A
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Method for explosively expanding a pillar
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US4513665A
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Method for loading explosive charges into blastholes formed in a subterranean formation
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US4466668A
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Method of forming an in situ oil shale retort in formation with joints
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US4458948A
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Horizontal free face blasting for minimizing channeling and mounding in situ retort with cusp at intermediate elevation
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US4489983A
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Blasthole spacing for control of particle size
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US4449753A
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Method for bulking full a retort
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US4444433A
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Method for forming an in situ oil shale retort in differing grades of oil shale
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US4440447A
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Method for forming an in situ oil shale retort with explosive expansion towards a horizontal free face
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US4453769A
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In situ oil shale retort having horizontal voids with side pillars
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US4402550A
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Method for forming an in situ oil shale retort with controlled seismic vibration
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US4440446A
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Method for forming a module of in situ oil shale retorts
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US4441760A
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Method for closing a drift between adjacent in situ oil shale retorts
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