US PATENT SUBCLASS 208 / 223
.~.~.~ Inorganic acid

Current as of: June, 1999
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208 /   HD   MINERAL OILS: PROCESSES AND PRODUCTS

177  DF  REFINING {23}
208 R  DF  .~ Sulfur removal (free or combined sulfur) {17}
219  DF  .~.~ With acids {4}
223.~.~.~ Inorganic acid {2}
224  DF  .~.~.~.~> Sulfuric acid
225  DF  .~.~.~.~> Hydrochloric acid

DEFINITION

Classification: 208/223

(under subclass 219) Processes wherein an inorganic acid is employed.