US PATENT SUBCLASS 208 / 279
.~.~ Phosphorus containing acid


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208 /   HD   MINERAL OILS: PROCESSES AND PRODUCTS

177  DF  REFINING {23}
265  DF  .~ With acids {4}
279.~.~ Phosphorus containing acid


DEFINITION

Classification: 208/279

(under subclass 265) Processes wherein a phosphorus containing acid is employed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

292, for other refining processes wherein phosphorus containing materials such as phosphoric anhydride are used.