US PATENT SUBCLASS 208 / 279
.~.~ Phosphorus containing acid
Current as of:
June, 1999
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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.