US PATENT SUBCLASS 562 / 896
.~.~.~.~ Vapor phase

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}
888  DF  .~.~ Processes of forming the -C(=O)-O-C(=O)- group {7}
895  DF  .~.~.~ Dehydration of two like or different molecules of carboxylic acid {1}
896.~.~.~.~ Vapor phase

DEFINITION

Classification: 562/896

(under subclass 895) Processes wherein the dehydration is conducted in vapor phase.