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Class Information
Number: 208/31R
Name: Mineral oils: processes and products >
Description:

Sub-classes under this class:

Class Number	Class Name	Patents
208/1	Synthetic drying oils	0
208/12	Colorng treatments (includes fluorescence)	29
208/13	Treatment of refining sludge	111
208/14	Products and compositions	160
208/177	Refining	139
208/2	Phenolic or toxic oils	8
208/24	Paraffin wax; treatment or recovery	45
208/3	Oxidation of mineral oils	43
208/308	Fractionation	75
208/370	Miscellaneous	67
208/39	Asphalts, tars, pitches and resins; making, treating and recovery	257
208/390	Tar sand treatment with liquid	197
208/400	By treatment of solid mineral, e.g., coal liquefaction, etc.	96
208/46	Chemical conversion of hydrocarbons	256
208/950	Processing of "fischer-tropsch" crude	125
208/951	Solid feed treatment with a gas other than air, hydrogen or steam	93
208/952	Solid feed treatment under supercritical conditions	56
208/DIG.1	Automatic control	213
208/DIG.2	Molecular sieve	31