US PATENT SUBCLASS 208 / 256
.~.~ With acid
Current as of:
June, 1999
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208 /
HD
MINERAL OILS: PROCESSES AND PRODUCTS
177
DF
REFINING
{23}
255
DF
.~ Gum or gum former removal {2}
256
.~.~ With acid
DEFINITION
Classification: 208/256
(under subclass 255) Processes wherein an acid is employed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
90, for processes of acid refining of mineral oil combined with a subsequent chemical conversion.
98, for processes of chemical conversion of a mineral oil combined with acid refining a product thereof.
219+, for processes of desulfurization of mineral oils with acids.
252, for processes of removing metallic contaminants with acids.
265+, for other processes of refining of mineral oils with acids.
