|
US2713035A
|
|
Treatment of alkaline earth metal petroleum sulfonates
|
|
US2794512A
|
|
Means for determining acoustical velocity and attenuation characteristics of subterranean formations
|
|
US2603804A
|
|
Plug for removing paraffing accumulating in oil conduits
|
|
US2538870A
|
|
Dewaxing hydrocarbon oil with vortex separator
|
|
US2413852A
|
|
Rust-inhibiting lubricant
|
|
US2285294A
|
|
Treatment of hydrocarbons
|
|
US2269467A
|
|
Recovery of solvent from hydrocarbon oils
|
|
US2286414A
|
|
Treatment of asphalt
|
|
US2181143A
|
|
Motor fuel
|
|
US2150183A
|
|
Treatment of hydrocarbons
|
|
US1998464A
|
|
Separation of oil-wax mixtures
|
