US PATENT SUBCLASS 562 / 892
.~.~.~ Ketone or ketene reactant

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}
892.~.~.~ Ketone or ketene reactant

DEFINITION

Classification: 562/892

(under subclass 888) Processes wherein a ketene or a ketone is used as a reactant.

(1) Note. The structure of ketene is: [figure]