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.