US PATENT SUBCLASS 568 / 302
.~.~.~ Ketene per se (i.e., HCH=C=O)


Current as of: June, 1999
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568 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {4}
300  DF  .~ OXYGEN CONTAINING (E.G., PERCHLORYLBENZENE, ETC.) {11}
301  DF  .~.~ Ketenes (e.g., halogenated ketenes, etc.) {1}
302.~.~.~ Ketene per se (i.e., HCH=C=O)


DEFINITION

Classification: 568/302

(under subclass 301) Compounds which contain the following structure: [figure]