US PATENT SUBCLASS 208 / 224
.~.~.~.~ Sulfuric 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  DF  .~.~.~ Inorganic acid {2}
224.~.~.~.~ Sulfuric acid

DEFINITION

Classification: 208/224

(under subclass 223) Processes wherein sulfuric acid is employed.