|
US2586862A
|
|
Retort
|
|
US2543378A
|
|
Viscosity breaker and dirt remover
|
|
US2412427A
|
|
Refining of low-grade hydrocarbon oils
|
|
US2397432A
|
|
Apparatus for treating carbonaceous material
|
|
US2437439A
|
|
Art of converting petroleum crudes
|
|
US2385731A
|
|
Retort
|
|
US2377518A
|
|
Apparatus for distilling oil shale and the like
|
|
US2232971A
|
|
Process of desulphurizing hydrocarbon oils
|
|
US2239859A
|
|
Method of purifying hydrocarbon oils
|
|
US1843174A
|
|
Coal distillation apparatus
|
|
US1710070A
|
|
Still
|
|
US1684685A
|
|
Liquid fuel
|
|
US1684686A
|
|
Aqueous liquid fuel
|
|
US1491275A
|
|
Liquid fuel
|
|
CA249287A
|
|
Liquid fuel
|
|
CA462452A
|
|
Method of and apparatus for treating carbonaceous material
|
|
CA525504A
|
|
Apparatus for treating and calcining carbonaceous materials
|
|
CA530402A
|
|
Retorts
|
|
CA459928A
|
|
Means for and method of refining hydrocarbon oils
|
