|
US2386036A
|
|
Method for secondary recovery of oil
|
|
US2251916A
|
|
Water mining soluble materials
|
|
US2161800A
|
|
Mining potash
|
|
US2156333A
|
|
Cleaning oil well drilling fluids
|
|
US2073413A
|
|
Drilling fluids
|
|
US2044758A
|
|
Aqueous suspension compositions
|
|
US1958744A
|
|
Antiknock compound for internal combustion engines and process of making same
|
|
GB332604A
|
|
Mixture of gel-forming silicate materials and method of making and applying the same
|
|
GB273256A
|
|
Improvements in the conversion of heavier hydrocarbons into lighter hydrocarbons
|
|
GB275313A
|
|
Improved process for producing mixed phenols and related compounds
|
|
US1640648A
|
|
Method of treating coffee
|
|
US1820908A
|
|
Process for obtaining phenols from coal tar distillates
|
|
US1883593A
|
|
Antiknock compounds for internal combustion engines and process of making same
|
|
GB227084A
|
|
Improvements in materials for refining hydrocarbon oils
|
|
US1623018A
|
|
Method of treating petroleum
|
|
US1515733A
|
|
Refining material
|
|
US1654581A
|
|
Process of desulphurizing and purifying petroleum oil
|
|
US1587491A
|
|
Process of treating hydrocarbons
|
|
GB191318A
|
|
Improved process for converting hydrocarbon oils into oils of lower boiling-point
|
|
US1591744A
|
|
Method of treating hydrocarbons
|
