US PATENT SUBCLASS 562 / 898
.~.~ Purification or recovery
Current as of:
June, 1999
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562 /
HD
ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
*
DD
ORGANIC COMPOUNDS (Class 532, Subclass 1)
{41}
887
DF
.~ Carboxylic acid anhydrides (i.e., compounds having the -C(=O)-O-C(=O)- group) {2}
898
.~.~ Purification or recovery
DEFINITION
Classification: 562/898
(under subclass 887) Processes wherein the carboxylic acid anhydride is separated from impurities or from the reaction mixture.