US PATENT SUBCLASS 568 / 301
.~.~ Ketenes (e.g., halogenated ketenes, etc.)

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.~.~ Ketenes (e.g., halogenated ketenes, etc.) {1}
302  DF  .~.~.~> Ketene per se (i.e., HCH=C=O)

DEFINITION

Classification: 568/301

(under subclass 300) Compounds which contain the following structure: [figure]

SEE OR SEARCH CLASS

549, Organic Compounds,

327, for diketenes. According to ozonolysis and X-ray analysis, diketenes have the following structure: [figure]