US PATENT SUBCLASS 562 / 858
.~.~.~ 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}
840  DF  .~ Carboxylic halides (i.e., compounds having the -C(=O)-halo group) {11}
856  DF  .~.~ Processes {7}
858.~.~.~ Ketene reactant

DEFINITION

Classification: 562/858

(under subclass 856) Processes wherein a ketene reactant is utilized.

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