Staged hydroconversion of an oil-coal mixture

Staged hydrogenation of low rank coal

Staged temperature coal conversion process

Steam recycle used as stripping gas in oil shale retorting

Supercritical extraction and simultaneous catalytic hydrogenatio

Supercritical tar sand extraction

Supplemental pyrolysis and fines removal in a process for pyroly

Supported chromium-molybdenum and tungsten sulfide catalysts

Supported transition metal sulfide promoted molybdenum or tungst

Surge bin retorting solid feed material

Synthetic crude from coal

Synthetic oil with a high viscosity number and a low pour point

System and method for lowered hydrogen sulfide emissions from oi

System for handling the underflow from a primary separation vess

System for utilizing oil shale fines

Tar sands extraction process

Tar sands recovery process

Temperature gradient in retort for pyrolysis of carbon containin

Three-stage coal liquefaction process

Three-stage coal liquefaction process